* add msys2 ci job
* run CI on any branch
* install base-devel on msys2
* remove soname and nodefaultlibs flags from mingw
* avoid soname on Windows
* add OLM_DLLEXPORT to signgam
it needs to be exported from the DLL also
* define IMPORT_EXPORTS on WINNT
While there are function export thunks in the import library that allow the linker to do the right thing for functions even if this is not set, it is required for the linker to do the right thing with variables being imported from a DLL (namely, signgam)
* add OLM_DLLEXPORT to openlibm_fenv_i387.h
seems this whole header was overlooked
* Update openlibm_fenv_i387.h
include openlibm_defs.h for OLM_DLLEXPORT
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