git-p4: use absolute directory for PWD env var

diff --git a/RelNotes b/RelNotes
index 136c1b6afa6bc9cee85b018cd5df66c639c3fc91..766bbaf8f5a90759645200e1fc61e11d9836de49 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.7.1.1.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.9.txt
\ No newline at end of file