[OE-core] [oe-core][PATCH] gcc-source: fix bug to avoid building error.

[Bian Naimeng]

gcc-source don't do do_package_write_rpm, so we should set
PACKAGES = "" to avoid the building error if we want generate srpm,
otherwise, we get the error as below.

ERROR: Task do_deploy_archives in meta/recipes-devtools/gcc/gcc-source_4.9.bb \
       depends upon non-existent task do_package_write_rpm in \
       meta/recipes-devtools/gcc/gcc-source_4.9.bb

Signed-off-by: Bian Naimeng <biannm at cn.fujitsu.com>
---
 meta/recipes-devtools/gcc/gcc-source.inc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/meta/recipes-devtools/gcc/gcc-source.inc b/meta/recipes-devtools/gcc/gcc-source.inc
index 968830a..10e9285 100644
--- a/meta/recipes-devtools/gcc/gcc-source.inc
+++ b/meta/recipes-devtools/gcc/gcc-source.inc
@@ -19,6 +19,7 @@ STAMPCLEAN = "${STAMPS_DIR}/work-shared/gcc-[0-9]*-*"
 
 INHIBIT_DEFAULT_DEPS = "1"
 DEPENDS = ""
+PACKAGES = ""
 
 python do_preconfigure () {
     import subprocess
-- 
1.9.1