libsigcpp: conan v2 support

[SpaceIm]

Specify library name and version: lib/1.0

---

• I've read the contributing guidelines.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[ghost]

I detected other pull requests that are modifying libsigcpp/3.x.x recipe:

• Libsigcpp conanv2 #12775

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[github-actions]

Hooks produced the following warnings for commit 07eb0d6

libsigcpp/3.0.7

post_source(): WARN: [SHORT_PATHS USAGE (KB-H066)] The file './untracked/docs/docs/reference/html/structsigc_1_1unwrap__reference_3_01std_1_1reference__wrapper_3_01const_01T__type_01_4_01_4-members.html' has a very long path and may exceed Windows max path length. Add 'short_paths = True' in your recipe.
post_source(): WARN: [SHORT_PATHS USAGE (KB-H066)] The file './untracked/docs/docs/reference/html/classsigc_1_1bound__argument_3_01std_1_1reference__wrapper_3_01const_01T__wrapped_01_4_01_4-members.html' has a very long path and may exceed Windows max path length. Add 'short_paths = True' in your recipe.
post_source(): WARN: [SHORT_PATHS USAGE (KB-H066)] The file './untracked/docs/docs/reference/html/classsigc_1_1bound__argument_3_01std_1_1reference__wrapper_3_01const_01T__wrapped_01_4_01_4-members.html' has a very long path and may exceed Windows max path length. Add 'short_paths = True' in your recipe.

[uilianries]

LGTM

[jwillikers]

Thank you!

[conan-center-bot]

Conan v1 pipeline

All green in build 4 (e8c3a26b9eff84508e7b96b6f454bbf8d4d304d4):

• libsigcpp/2.10.8@:
  All packages built successfully! (All logs)

• libsigcpp/3.0.7@:
  All packages built successfully! (All logs)

• libsigcpp/3.0.0@:
  All packages built successfully! (All logs)

[github-actions]

Hooks produced the following warnings for commit e8c3a26

libsigcpp/3.0.7

post_source(): WARN: [SHORT_PATHS USAGE (KB-H066)] The file './untracked/docs/docs/reference/html/structsigc_1_1unwrap__reference_3_01std_1_1reference__wrapper_3_01const_01T__type_01_4_01_4-members.html' has a very long path and may exceed Windows max path length. Add 'short_paths = True' in your recipe.
post_source(): WARN: [SHORT_PATHS USAGE (KB-H066)] The file './untracked/docs/docs/reference/html/classsigc_1_1bound__argument_3_01std_1_1reference__wrapper_3_01const_01T__wrapped_01_4_01_4-members.html' has a very long path and may exceed Windows max path length. Add 'short_paths = True' in your recipe.
post_source(): WARN: [SHORT_PATHS USAGE (KB-H066)] The file './untracked/docs/docs/reference/html/classsigc_1_1bound__argument_3_01std_1_1reference__wrapper_3_01const_01T__wrapped_01_4_01_4-members.html' has a very long path and may exceed Windows max path length. Add 'short_paths = True' in your recipe.

[uilianries]

LGTM