Incorrect checkout of git submodules

When checking out git packages, buildroot doesn't seem to track the revisions
correctly of any submodules referenced by that project. As a result, the
submodule stays at whatever revision was referenced by the head of the master
branch. Running a 'git submodule update' after the checkout fixes this problem.

Signed-off-by: Owen Kirby <osk@exegin.com>

SVN-Revision: 38359

include/download.mk

@@ -88,7 +88,7 @@ define DownloadMethod/git
 		rm -rf $(SUBDIR) && \
 		[ \! -d $(SUBDIR) ] && \
 		git clone $(URL) $(SUBDIR) --recursive && \
-		(cd $(SUBDIR) && git checkout $(VERSION)) && \
+		(cd $(SUBDIR) && git checkout $(VERSION) && git submodule update) && \
 		echo "Packing checkout..." && \
 		rm -rf $(SUBDIR)/.git && \
 		$(call dl_pack,$(TMP_DIR)/dl/$(FILE),$(SUBDIR)) && \