[newlib-cygwin] Implement nanl in newlib only

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=682c4a9f1e77ced554e354bd2c1297b9afe2c6aa

commit 682c4a9f1e77ced554e354bd2c1297b9afe2c6aa
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Wed Oct 10 17:49:53 2018 +0200

    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>

Diff:
---
 newlib/libm/common/nanl.c | 6 ++++++
 winsup/cygwin/Makefile.in | 1 -
 winsup/cygwin/math/nanl.c | 5 -----
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/newlib/libm/common/nanl.c b/newlib/libm/common/nanl.c
index 40f8981..b8ae63e 100644
--- a/newlib/libm/common/nanl.c
+++ b/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
 
diff --git a/winsup/cygwin/Makefile.in b/winsup/cygwin/Makefile.in
index 966460d..a232836 100644
--- a/winsup/cygwin/Makefile.in
+++ b/winsup/cygwin/Makefile.in
@@ -218,7 +218,6 @@ MATH_OFILES:= \
 	lrintl.o \
 	lroundl.o \
 	modfl.o \
-	nanl.o \
 	nearbyint.o \
 	nearbyintf.o \
 	nearbyintl.o \
diff --git a/winsup/cygwin/math/nanl.c b/winsup/cygwin/math/nanl.c
deleted file mode 100644
index f936b31..0000000
--- a/winsup/cygwin/math/nanl.c
+++ /dev/null
@@ -1,5 +0,0 @@
-long double
-nanl (const char *tagp)
-{
-  return __builtin_nanl ("");
-}