setup_git_env: use git_pathdup instead of xmalloc + sprintf

diff --git a/RelNotes b/RelNotes
index 573ee74d24fb63ae5394d33efc06c2e3c3a0542e..bf760914010786c830233effc8b96ddacfb114fd 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.7.1.2.txt
\ No newline at end of file
+Documentation/RelNotes/2.1.0.txt
\ No newline at end of file