NetBSD/src 17pWKlVlib/libm Makefile

   Default our libm to -frounding-math, if built with GCC.

   The long-standing GCC default is to not respect rounding mode.
   it looks like GCC 7 optimizes rint to a builtin, causing our few
   rounding mode tests to fail.

   Fixes PR port-amd64/54000: FP tests failing on amd64 since gcc7 import
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1.206+2-1lib/libm/Makefile
+2-11 files

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