trees and git.sh: tidy up global variables

some of the variables only initialised in git.sh are
also used in the trees script, which is technically ok
because git.sh is included from the trees script, but
it makes more sense to declare them in the latter.

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

include/git.sh

@@ -2,8 +2,8 @@
 # Copyright (c) 2020-2021,2023-2024 Leah Rowe <leah@libreboot.org>
 # Copyright (c) 2022 Caleb La Grange <thonkpeasant@protonmail.com>
 
-eval `setvars "" rev loc url bkup_url depend tree_depend mdir subhash subrepo \
-    subrepo_bkup subfile subfile_bkup`
+eval `setvars "" loc url bkup_url subfile mdir subhash subrepo subrepo_bkup \
+    depend subfile_bkup`
 
 fetch_targets()
 {