[Mac] Roundup of fixes for building on mac #182
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Two of these changes are to get makefiles working properly on mac, the third was just nice since then I didn't have to specify which standard library to use (which might have changed between xcode versions).
For the linker one, it turns out -l isn't super portable, but ld is fully capable of taking in objects, archive and dynamic object (so,dynlib) by path directly without using -l.