cmake: do not use -fPIC for MSYS2 #3833
Merged
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The MSYS2 build system automatically compiles all code with position-independent
code. When we manually add the -fPIC flag to the compiler flags, MSYS2 will
loudly complain about PIC being the default and thus not required.
Fix the annoyance by stripping -fPIC in MSYS2 enviroments like it is already
done for MinGW.