Implement nanl in newlib only

Drop Cygwin-specific nanl in favor of a generic implementation
in newlib.  Requires GCC 3.3 or later.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

newlib/libm/common/nanl.c

@@ -38,5 +38,11 @@ nanl (const char *tagp)
 {
   return nan(tagp);
 }
+#elif __GNUC_PREREQ (3, 3)
+long double
+nanl (const char *tagp)
+{
+  return __builtin_nanl("");
+}
 #endif
 

winsup/cygwin/Makefile.in

@@ -218,7 +218,6 @@ MATH_OFILES:= \
 	lrintl.o \
 	lroundl.o \
 	modfl.o \
-	nanl.o \
 	nearbyint.o \
 	nearbyintf.o \
 	nearbyintl.o \

winsup/cygwin/math/nanl.c

@@ -1,5 +0,0 @@
-long double
-nanl (const char *tagp)
-{
-  return __builtin_nanl ("");
-}