tree.sh: check xgcc AFTER checking elfdir

if e.g. elf/coreboot/default/w500_16mb contains readied
images from before, crossgcc is still being checked.

if you already built all the coreboot images, and wanted
to just modify all the payloads for example, this would
result in a much slower re-build process, because it is
needlessly re-checking crossgcc every time.

by doing it this way, we need up the testing of payloads
quite considerably, during xbmk development.

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

include/tree.sh

@@ -111,15 +111,16 @@ handle_defconfig()
 
 	[ "$mode" = "${mode%clean}" ] && [ ! -d "$srcdir" ] && return 0
 
-	[ -z "$mode" ] && for _xarch in $xarch; do
-		$dry check_cross_compiler "$_xarch"
-	done; :
-
 	for y in "$target_dir/config"/*; do
 		[ "$_f" = "-d" ] || [ -f "$y" ] || continue
 		[ "$_f" = "-d" ] || defconfig="$y"
 
 		[ -n "$mode" ] || check_defconfig || continue
+
+		[ -z "$mode" ] && for _xarch in $xarch; do
+			$dry check_cross_compiler "$_xarch"
+		done; :
+
 		handle_makefile
 		[ -n "$mode" ] || $dry copy_elf
 	done; :