Reduce debug info for xcb.c since on mips we run into a gcc5 bug

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68302

This patch is a workaround to get past the gcc bug until its resolved.
it should have minimal impact on libxcb while make it work.

Upstream-Status: Inappropriate [OE-Specific]
Signed-off-by: Khem Raj <raj.khem@gmail.com>

Index: libxcb-1.11.1/src/Makefile.am
===================================================================
--- libxcb-1.11.1.orig/src/Makefile.am
+++ libxcb-1.11.1/src/Makefile.am
@@ -188,6 +188,7 @@ EXTSOURCES += xkb.c
 if BUILD_XKB
 lib_LTLIBRARIES += libxcb-xkb.la
 libxcb_xkb_la_LDFLAGS = -version-info 1:0:0 -no-undefined
+CFLAGS += -g1
 libxcb_xkb_la_LIBADD = $(XCB_LIBS)
 nodist_libxcb_xkb_la_SOURCES = xkb.c xkb.h
 endif