cmake: add resource file for Windows version info on DLL and EXE

This sadly doesn't work when compiling under MinGW; cmake has an unresolved bug
that passes all CFLAGS to windres, which pukes on them.
cmake: change name of MSVC built shared library to avoid filename conflicts

the shared library and CLI exe were both trying to write x265.pdb and x265.ilk
with unhelpful results.