[2/3] configure.ac: fix libm detection on Haiku

[Damjan Jovanovic]

Changelog:
* configure.ac: fix libm detection on Haiku

Avoids using "-lm" as a linker flag in configure, because that causes
compilation to fail for some configure tests, causing duplicate
definition of isinf() and isnan() which later breaks compilation of
Wine code. Also stores the LIBM for use by winegcc in the next patch.

Damjan Jovanovic
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