xbmk: general cleanup

note: mecleaner check removed in vendor.sh, because
it's already guaranteed to be fetched. the check will
never indicate failure, so we can just assume that
the me cleaner python script exists.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/env/init.sh

@@ -165,13 +165,11 @@ xbmk_parent_set_env()
 
 	x_ chmod -w "$xbmklock"
 
-	xbmk_parent_set_export
-	xbmk_set_version
+	forx 'xbmk_%s' parent_set_export set_version
 
 	remkdir "$xbtmp" "$xbtmp/xbmkpath"
 
-	xbmk_set_pyver
-	xbmk_set_mirror
+	forx 'xbmk_set_%s' pyver mirror
 }
 
 xbmk_parent_check_tmp()