[liba] Fixed Gamma function bug.

There was a problem with the definition of ldexp, used in b_log__D.c

Change-Id: I83d012815e38b76efa730c1a3d259ec276e15f11

liba/Makefile

@@ -12,7 +12,6 @@ objs += $(addprefix liba/src/, \
   fpclassify.o \
   fpclassifyf.o \
   ieee754.o \
-  ldexp.o \
   malloc.o \
   memcmp.o \
   memcpy.o \

liba/include/math.h

@@ -178,7 +178,7 @@ double trunc(double x);
 #define fabs(x) __builtin_fabs(x)
 #define floor(x) __builtin_floor(x)
 #define fmod(x, y) __builtin_fmod(x, y)
-#define ldexp(x, n) __builtin_ldexp(x, n)
+#define ldexp(x, n) __builtin_scalbn(x, n)
 #define lgamma(x) __builtin_lgamma(x)
 #define lgamma_r(x, signgamp) __builtin_lgamma_r(x, signgamp)
 #define log(x) __builtin_log(x)

liba/src/external/openbsd/include/math.h

@@ -61,7 +61,6 @@
 #undef fabs
 #undef floor
 #undef fmod
-#undef ldexp
 #undef lgamma
 #undef lgamma_r
 #undef log

liba/src/ldexp.c

@@ -1,9 +0,0 @@
-#include <math.h>
-
-#undef ldexp
-
-// For some reason, OpenBSD's libm defines ldexpf but doesn't define ldexp
-
-double ldexp(double x, int n) {
-  return scalbn(x, n);
-}