libm: unhide signgam

Fixes signgam checks in math tests on x86_64. It's R_X86_64_COPY for program,
so the program didn't see any changes from libm.

Signed-off-by: Roman I Khimov <khimov@altell.ru>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

include/math.h

@@ -193,7 +193,6 @@ extern long double __REDIRECT_NTH (nexttowardl,
 #if defined __USE_MISC || defined __USE_XOPEN
 /* This variable is used by `gamma' and `lgamma'.  */
 extern int signgam;
-libm_hidden_proto(signgam)
 #endif
 
 

libm/s_signgam.c

@@ -1,4 +1,3 @@
 #include "math.h"
 #include "math_private.h"
 int signgam = 0;
-libm_hidden_def(signgam)