[polyclipping] Also copy pdb files

[tobiasleibner]

Same problem and same solution as in the Catch2 port: #49707

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[BillyONeal]

I believe the correct fix is to use /Z7 instead. Build systems almost always pick names that will conflict with the universe for PDBs of static libs which is a big part of why we use /Z7.

[tobiasleibner]

/Z7 sounds like it is the proper fix but I am not sure how to apply it. If I understand correctly, we would like to

1. Check if the current toolchain requests program database debug information (Zi or ZI)
2. If it does, replace that with Z7.
   I am happy to do that but I will need some guidance because I am not sure how to do either of these steps.
   For 1.: Do I have to parse something like VCPKG_CXX_FLAGS? But that does not seem to be set in the portfile.
   For 2.: Can I provide that via -DCMAKE_CXX_FLAGS="/Z7" to the vcpkg_cmake_configure? But that might lose other flags and also cause warnings like "warning: overriding /Zi with /Z7".

My approach to copy the pdb files (https://github.com/microsoft/vcpkg/pull/49707/changes#diff-135c4b2289b6d5e5479d45db57022f97072fe8a4495899524af68b6251674981R46) is not pretty but seems to work and does not do anything if there are no pdb files. Also, the filename is polyclipping.pdb for me, but that might be due to my project settings. To make sure the pdb file has a proper name we can maybe set COMPILE_PDB_NAME on the polyclipping target? (Might need a patch to the CMakeLists.txt).