setup_git_env: use git_pathdup instead of xmalloc + sprintf

diff --git a/RelNotes b/RelNotes
index 028ad79e1f7226088102667085ca5ceb43c4d442..bf760914010786c830233effc8b96ddacfb114fd 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.7.2.2.txt
\ No newline at end of file
+Documentation/RelNotes/2.1.0.txt
\ No newline at end of file