mesa: Fix Cygwin build with llvm enabled.

On Cygwin locale_t in not available but 'llvm-config --cppflags' adds
the compiler flag -D_GNU_SOURCE to the build.

diff --git a/src/mesa/main/imports.c b/src/mesa/main/imports.c
index 25080db40c43f3b1ad8af3018b9c1ba2c7c05104..c399351096717ece4f6bde12e25e9332e2fe442a 100644 (file)
--- a/src/mesa/main/imports.c
+++ b/src/mesa/main/imports.c
@@ -756,7 +756,7 @@ _mesa_strdup( const char *s )
 float
 _mesa_strtof( const char *s, char **end )
 {
-#ifdef _GNU_SOURCE
+#if defined(_GNU_SOURCE) && !defined(__CYGWIN__)
    static locale_t loc = NULL;
    if (!loc) {
       loc = newlocale(LC_CTYPE_MASK, "C", NULL);