Tune the definitions needed when building with -ansi.
The current definitions were mostly useful to glibc and followed its feature_test_macros(3) documentation. However, this means other platforms still had problems when building with strict compilation flags. _BSD_SOURCE, for example, is only recognized by glibc, and other platforms sometimes need _XOPEN_SOURCE instead, or even the removal of some definitions (such as the outdate _POSIX_SOURCE one). _POSIX_SOURCE also had to be conditionally defined in some places, as what it enables or disables during compilation varies across systems.pull/1/head
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