Minor mlib tweaks and fixes #302
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This changeset comes from tentative inclusion in mongo-c-driver for the csfle patch, which uncovered a few quirks and possible improvements:
mlib.cmaketo define an import the library and its tests as a one-liner in the parent project.mlib_inlineis a platform-specificinlinekeywordmlib_inline_defis a psuedo-keyword function attribute that mimics the link-once behavior of C++inline(usingweaklinkage on ELF/macOS, while COFF (Windows)inlinealways has this behavior).WideCharToMultiByte(discovered in the MinGW target of the C driver's build).