Fix protobuf compilation under MSYS2

[netheril96]

Building protobuf on MSYS2 fails on the line 100. Apparently the conan detection of is_msvc and is_clang_cl is flawed. Work around this by guarding the statement.

Specify library name and version: protobuf/3.21.12

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• I've tried at least one configuration locally with the conan-center hook activated. --No, the hooks only work on v1.

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All committers have signed the CLA.

[github-actions]

🤖 Beep Boop! This pull request is making changes to 'recipes/protobuf//'.

👋 @Hopobcn you might be interested. 😉

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 1 (e93ae0a00a3a0ba5a9f09de4f77158bca63f9c49):

• protobuf/3.21.12:
  All packages built successfully! (All logs)

• protobuf/3.18.3:
  All packages built successfully! (All logs)

• protobuf/3.19.6:
  All packages built successfully! (All logs)

• protobuf/3.17.1:
  All packages built successfully! (All logs)

• protobuf/3.21.9:
  All packages built successfully! (All logs)

• protobuf/3.20.3:
  All packages built successfully! (All logs)

• protobuf/3.20.0:
  All packages built successfully! (All logs)

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Conan v2 pipeline ❌

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

The v2 pipeline failed. Please, review the errors and note this is required for pull requests to be merged. In case this recipe is still not ported to Conan 2.x, please, ping @conan-io/barbarians on the PR and we will help you.

See details:

Failure in build 1 (e93ae0a00a3a0ba5a9f09de4f77158bca63f9c49):

• protobuf/3.21.12:
  CI failed to create some packages (All logs)

  Logs for packageID 52a397893f0af4f4a9261eb1e41607fe368b85d9:

  [settings]
  arch=x86_64
  build_type=Release
  compiler=apple-clang
  compiler.cppstd=17
  compiler.libcxx=libc++
  compiler.version=13
  os=Macos
  [options]
  */*:shared=False
  

  [...]
  ======== Computing necessary packages ========
  protobuf/3.21.12: Checking 11 compatible configurations
  protobuf/3.21.12: Compatible configurations not found in cache, checking servers
  protobuf/3.21.12: '38124c72e67e02c91484d17663550396af6b0e14': compiler.cppstd=98
  protobuf/3.21.12: 'fcd872d0b60dd895296887c94feb12e139c0833e': compiler.cppstd=gnu98
  protobuf/3.21.12: '403cfed5c64728d37b771f005d8124f06cfa1ac4': compiler.cppstd=11
  protobuf/3.21.12: 'd7ec780e0404d27067bc4b956c4fd90fe68d71fb': compiler.cppstd=gnu11
  protobuf/3.21.12: '7602b10ddf1e5c9bcc37625974d2ce8ac46fdde7': compiler.cppstd=14
  protobuf/3.21.12: '9d66a1d4374e2724df72ece9a1cc5eb3835eaf3e': compiler.cppstd=gnu14
  protobuf/3.21.12: '44c0bcea203e5eb80676bcb55d661b9f247f39e6': compiler.cppstd=gnu17
  protobuf/3.21.12: '3f0e35c7959f0a3329ebebfd32598a03fbbb3d53': compiler.cppstd=20
  protobuf/3.21.12: 'f64bdd992ddb5130c9b09a7857339c8ac74ff954': compiler.cppstd=gnu20
  protobuf/3.21.12: '1fbbc61009b3e4c956098232649a273a20f4edd0': compiler.cppstd=23
  protobuf/3.21.12: 'a57fa2b2ec8793d3c40d202ffd72563fafd5ff8c': compiler.cppstd=gnu23
  Requirements
      protobuf/3.21.12#687d74df149f386f437ed5c0f1b2b423:52a397893f0af4f4a9261eb1e41607fe368b85d9#0be725d858458f4ad64d9e61d2572657 - Cache
      zlib/1.3.1#af8f2ef3d8e0fddf1975281d7fe43bf6:d62dff20d86436b9c58ddc0162499d197be9de1e#2f2517dbcbe63c245561b0e27200e56b - Cache
  Build requirements
      protobuf/3.21.12#687d74df149f386f437ed5c0f1b2b423:8a8d765d8aee62c4e31f64c52cc1ef11b74902b7 - Missing
  Skipped binaries
      zlib/1.3.1
  
  ======== Installing packages ========
  ERROR: Missing binary: protobuf/3.21.12:8a8d765d8aee62c4e31f64c52cc1ef11b74902b7
  
  protobuf/3.21.12: WARN: Can't find a 'protobuf/3.21.12' package binary '8a8d765d8aee62c4e31f64c52cc1ef11b74902b7' for the configuration:
  [settings]
  arch=armv8
  build_type=Release
  compiler=apple-clang
  compiler.cppstd=17
  compiler.libcxx=libc++
  compiler.version=13
  os=Macos
  [options]
  debug_suffix=True
  fPIC=True
  lite=False
  shared=False
  with_rtti=True
  with_zlib=True
  [requires]
  zlib/1.3.Z
  
  ERROR: Missing prebuilt package for 'protobuf/3.21.12'. You can try:
      - List all available packages using 'conan list protobuf/3.21.12:* -r=remote'
      - Explain missing binaries: replace 'conan install ...' with 'conan graph explain ...'
      - This is a **test_package** missing binary. You can use --build (for all dependencies) or --build-test (exclusive for 'test_package' dependencies) to define what can be built from sources
  
  More Info at 'https://docs.conan.io/2/knowledge/faq.html#error-missing-prebuilt-package'
  

• protobuf/3.21.9:
  Didn't run or was cancelled before finishing

• protobuf/3.20.0:
  Didn't run or was cancelled before finishing

• protobuf/3.17.1:
  Didn't run or was cancelled before finishing

• protobuf/3.18.3:
  Didn't run or was cancelled before finishing

• protobuf/3.19.6:
  Didn't run or was cancelled before finishing

• protobuf/3.20.3:
  Didn't run or was cancelled before finishing

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^{Note: To save resources, CI tries to finish as soon as an error is found. For this reason you might find that not all the references have been launched or not all the configurations for a given reference. Also, take into account that we cannot guarantee the order of execution as it depends on CI workload and workers availability.}