Use HAVE_C99_MATH instead of _WIN32_ and __ANSI__ #647
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HAVE_C99_MATH was recently added to the build system as a safer way to
determine if non-ansi math functions are available on the current
system. Previously different combinations of tests including _WIN32_ and
__ANSI__ have been in use, but cases where that strategy has failed is
known. Hence this change to a hopefully more robust check of math
function availability.
See also #547 and #555