[libgfortran, patch] Fix compilation on HP/UX 10

[FX]

ping

> Attached patch should fix compilation of libgfortran on hppa1.1-hp-hpux10.20 (see PR60468: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60468), by adding a missing <math.h> header to the configure checks.
> 
> I’ve tested that it doesn’t break bootstrap on x86_64-apple-darwin, but not on hpux10. It seems safe enough to me to proceed first, and let John test in his next build of trunk (bootstrap on those machines probably isn’t fast).
> 
> OK to commit?
> 
> FX

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