mesa: Don't use newlocale on Haiku

NOTE: This is a candidate for the 8.0 branch.

Signed-off-by: Brian Paul <brianp@vmware.com>

src/mesa/main/imports.c

@@ -764,7 +764,7 @@ float
 _mesa_strtof( const char *s, char **end )
 {
 #if defined(_GNU_SOURCE) && !defined(__CYGWIN__) && !defined(__FreeBSD__) && \
-    !defined(ANDROID)
+   !defined(ANDROID) && !defined(__HAIKU__)
    static locale_t loc = NULL;
    if (!loc) {
       loc = newlocale(LC_CTYPE_MASK, "C", NULL);