devel/google{test,mock}: simplify and modernize
- Convert to the new testing framework
- Add upstream fix for gmock_doctor.py to work with python3, so keep existing |/usr/bin/env python| shebang
- Drop fused-src tests as the ports don't install source files
- No need to shebangfix files we don't install
- Provide LICENSE_FILE as there's none under Templates/Licenses/
- Sort declarations by the order they're run (ldconfig is last)
- Silence post-patch commands [1]
PR: 203514
Submitted by: amdmi3 [1]
Reviewed by: amdmi3 (previous version)