Fix compile time errors when building against uclibc

Mesa misses a few checks when compiling on a uclibc system
which cause it to fall back on glibc-ism.  This patch
addresses those issues.

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>

diff -Naur Mesa-8.0.4.orig/src/gallium/auxiliary/util/u_debug_symbol.c Mesa-8.0.4/src/gallium/auxiliary/util/u_debug_symbol.c
--- Mesa-8.0.4.orig/src/gallium/auxiliary/util/u_debug_symbol.c	2012-07-24 18:55:48.580000000 +0000
+++ Mesa-8.0.4/src/gallium/auxiliary/util/u_debug_symbol.c	2012-07-24 18:57:02.910000000 +0000
@@ -152,7 +152,9 @@
 #endif
 
 #ifdef __GLIBC__
+#ifndef __UCLIBC__
 #include <execinfo.h>
+#endif
 
 /* This can only provide dynamic symbols, or binary offsets into a file.
  *
diff -Naur Mesa-8.0.4.orig/src/glsl/strtod.c Mesa-8.0.4/src/glsl/strtod.c
--- Mesa-8.0.4.orig/src/glsl/strtod.c	2012-07-24 18:55:48.580000000 +0000
+++ Mesa-8.0.4/src/glsl/strtod.c	2012-07-24 18:56:37.850000000 +0000
@@ -45,7 +45,7 @@
 glsl_strtod(const char *s, char **end)
 {
 #if defined(_GNU_SOURCE) && !defined(__CYGWIN__) && !defined(__FreeBSD__) && \
-   !defined(__HAIKU__)
+   !defined(__HAIKU__) && !defined(__UCLIBC__)
    static locale_t loc = NULL;
    if (!loc) {
       loc = newlocale(LC_CTYPE_MASK, "C", NULL);
diff -Naur Mesa-8.0.4.orig/src/mesa/main/imports.c Mesa-8.0.4/src/mesa/main/imports.c
--- Mesa-8.0.4.orig/src/mesa/main/imports.c	2012-07-24 18:55:48.580000000 +0000
+++ Mesa-8.0.4/src/mesa/main/imports.c	2012-07-24 18:56:37.850000000 +0000
@@ -767,7 +767,7 @@
 _mesa_strtof( const char *s, char **end )
 {
 #if defined(_GNU_SOURCE) && !defined(__CYGWIN__) && !defined(__FreeBSD__) && \
-   !defined(ANDROID) && !defined(__HAIKU__)
+   !defined(ANDROID) && !defined(__HAIKU__) && !defined(__UCLIBC__)
    static locale_t loc = NULL;
    if (!loc) {
       loc = newlocale(LC_CTYPE_MASK, "C", NULL);