[Bug libquadmath/68686] tgammaq(x) is always negative for noninteger x < 0

[kahrl at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68686

--- Comment #1 from kahrl at gmx dot net ---
Created attachment 36907
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36907&action=edit
Generated by gcc -v -save-temps -o tgammaq-bug tgammaq-bug.c -lquadmath