glsl: 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/glsl/strtod.c

@@ -44,7 +44,8 @@
 double
 glsl_strtod(const char *s, char **end)
 {
-#if defined(_GNU_SOURCE) && !defined(__CYGWIN__) && !defined(__FreeBSD__)
+#if defined(_GNU_SOURCE) && !defined(__CYGWIN__) && !defined(__FreeBSD__) && \
+   !defined(__HAIKU__)
    static locale_t loc = NULL;
    if (!loc) {
       loc = newlocale(LC_CTYPE_MASK, "C", NULL);