[PATCH] Make gitk work when launched in a subdirectory

Make gitk use git-rev-parse --git-dir to find the repository.
Signed-off-by: NPeter Baumann <siprbaum@stud.informatik.uni-erlangen.de>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

gitk

@@ -12,7 +12,7 @@ proc gitdir {} {
     if {[info exists env(GIT_DIR)]} {
 	return $env(GIT_DIR)
     } else {
-	return ".git"
+	return [exec git rev-parse --git-dir]
     }
 }