distutils: handle unlinkable object files in build_clib/build_ext, not gnu

Add concept of unlinkable Fortran object files on the level of
build_clib/build_ext.

Make build_clib generate fake static libs when unlinkable object files are
present, postponing the actual linkage to build_ext.

This enables MSVC+gfortran DLL chaining to only involve those DLLs that
are actually necessary for each .pyd file, rather than linking everything
in to every file. Linking everything to everywhere has issues due to
potential symbol clashes and the fact that library build order is
unspecified.

Record shared_libs on disk instead of in system_info. This is necessary
for partial builds -- it is not guaranteed the compiler is actually called
for all of the DLL files.

Remove magic from openblas msvc detection. That this worked previously
relied on the side effect that the generated openblas DLL would be added
to shared_libs, and then being linked to all generated outputs.

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