glx: Make __glXSendError available in non-Apple builds

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Cc: Jeremy Huddleston <jeremyhu@apple.com>

src/glx/Makefile

@@ -15,6 +15,7 @@ SOURCES = \
 	  glxconfig.c \
 	  glxcmds.c \
 	  glxcurrent.c \
+	  glx_error.c \
 	  glxext.c \
 	  glxextensions.c \
 	  indirect_glx.c \

src/glx/apple/Makefile

@@ -39,7 +39,7 @@ SOURCES = \
 	../compsize.c \
 	../glxconfig.c \
 	glx_empty.c \
-	glx_error.c \
+	../glx_error.c \
 	../glx_pbuffer.c \
 	../glx_query.c \
 	../glxcmds.c \