[fortran,patch] Fix detection of fpsetmask()

[FX]

The recent report by Anton on the fortran list showed that, on ia64-freebsd and sparc64-freebsd systems, the runtime support for the -ffpe-trap option is not compiled. FreeBSD has the SysV fpsetmask() function, which should be detected and used, but was not because of a bug in the configure script.

The attached patch fixes that. Yields good results on both ia64-freebsd and sparc64-freebsd. Bootstrapped and manually checked on x64_64-darwin (where it makes no difference, of course).

OK to commit to trunk?

Also, since the bug was present since the original introduction of the feature, it may be a candidate for a 4.5 backport once it's proven not to break the build on the trunk for some time. However, it affects a very small number of systems: only non-(x86|x86_64) Unix, without the glibc-style fenv.h functions or the AIX fp_trap() function, so I wouldn't push it if it were up to me.

Cheers,
FX


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