stubdom: remove EXTRA_CFLAGS meant for building tools

When building stubdoms EXTRA_CFLAGS_XEN_TOOLS and
EXTRA_CFLAGS_QEMU_TRADITIONAL should be cleared as they might contain
flags not suitable for all stubdom builds (e.g. "-m64" often to be
found in $RPM_OPT_FLAGS will break building 32 bit stubdoms).

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

stubdom/Makefile

@@ -4,6 +4,10 @@ MINI_OS = $(XEN_ROOT)/extras/mini-os
 export XEN_ROOT
 export XEN_OS=MiniOS
 
+# Remove flags which are meant for tools, e.g. "-m64"
+export EXTRA_CFLAGS_XEN_TOOLS=
+export EXTRA_CFLAGS_QEMU_TRADITIONAL=
+
 export stubdom=y
 export debug=y
 # Moved from config/StdGNU.mk