Statically link against libstdc++ on Linux (#6)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 6 to 7.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
 
       - name: Setup Python (Windows)
         if: matrix.target.os_name == 'windows'
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: '3.12'
 

AMBuildScript

@@ -217,6 +217,7 @@ class SteamWorksConfig(object):
         cxx.linkflags += ['-static-libgcc']
       elif cxx.family == 'clang':
         cxx.linkflags += ['-lgcc_eh']
+      cxx.linkflags += ['-static-libstdc++']
     elif cxx.target.platform == 'windows':
       cxx.defines += ['WIN32', '_WINDOWS']