[COMMITTED] math: Fix non-portability in the computation of signgam in lgammaf

[Wilco Dijkstra]

Hi Adhemerval,

+  if (__glibc_unlikely (fx >= 0))
+    *signgamp = 1;

Did you mean likely here (as the description suggests)?

Note if negative values are frequent, the branch may be less predictable than before.

Cheers,
Wilco