Clone repositories with depth of 1

Signed-off-by: Sergii Dmytruk <[email protected]>

Makefile

@@ -313,7 +313,7 @@ define define_module =
     # that the files are all present. No signature hashes are checked in
     # this case, since we don't have a stable version to compare against.
     $(build)/$($1_base_dir)/.canary:
-	git clone $($1_repo) "$(build)/$($1_base_dir)"
+	git clone --depth=1 $($1_repo) "$(build)/$($1_base_dir)"
 	cd $(build)/$($1_base_dir) && git submodule update --init --checkout
 	if [ -r patches/$($1_patch_name).patch ]; then \
 		( cd $(build)/$($1_base_dir) ; patch -p1 ) \