disable when backtrace, when debug is enabled

package/mesa/patches/patch-src_mapi_glapi_glapi_gentable_c

@@ -0,0 +1,14 @@
+--- mesa-11.0.6.orig/src/mapi/glapi/glapi_gentable.c	2015-11-21 12:45:27.000000000 +0100
++++ mesa-11.0.6/src/mapi/glapi/glapi_gentable.c	2016-01-05 22:36:19.266092512 +0100
+@@ -35,11 +35,6 @@
+ #include <dix-config.h>
+ #endif
+ 
+-#if (defined(GLXEXT) && defined(HAVE_BACKTRACE)) \
+-	|| (!defined(GLXEXT) && defined(DEBUG) && !defined(__CYGWIN__) && !defined(__MINGW32__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__DragonFly__))
+-#define USE_BACKTRACE
+-#endif
+-
+ #ifdef USE_BACKTRACE
+ #include <execinfo.h>
+ #endif