net-snmp: migrate to Conan v2

[valgur]

No description provided.

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions]

Hooks produced the following warnings for commit 9021e52

net-snmp/5.9.4@#50a2ff2f435494d001d6d85bdd7acaa1

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libnetsnmp.so' links to system library 'm' but it is not in cpp_info.system_libs.
post_package(): WARN: [APPLE RELOCATABLE SHARED LIBS (KB-H077)] install_name dir of these shared libs is not @rpath: libnetsnmp.dylib, libnetsnmp.40.dylib

[uilianries]

I did some changes to this PR, I guess is okay at current state to be merged in case passing:

• MSVC actually works, only fails when building shared library
• OpenSSL 3.x is also support, added range versions: net-snmp 5.9.4 and its supported OpenSSL version net-snmp/net-snmp#768
• Removed Neutrino support. It comes from another PR, and we have no build log that ensure it's working.
• Add missing system libraries and frameworks
• Removed CMake as build requirement for test package. I remember there was an old bug, but fixed in Conan client at some point.
• Added pkg-config as tool requirement in order to find OpenSSL when cross-building on Mac.

[uilianries]

LGTM.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 11 (9fe841686e33c9a971fd1598b071edb285e93ca7):

• net-snmp/5.9.4:
  All packages built successfully! (All logs)

---

Conan v2 pipeline ✔️

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

All green in build 11 (9fe841686e33c9a971fd1598b071edb285e93ca7):

• net-snmp/5.9.4:
  All packages built successfully! (All logs)