ls-remote and clone: accept --upload-pack=<path> as well.

This makes them consistent with other commands that take the
path to the upload-pack program.  We also pass --upload-pack
instead of --exec to the underlying fetch-pack, although it is
not strictly necessary.

[jc: original motivation from Uwe]

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-ls-remote.sh

@@ -23,7 +23,11 @@ do
   -u|--u|--up|--upl|--uploa|--upload|--upload-|--upload-p|--upload-pa|\
   --upload-pac|--upload-pack)
 	shift
-	exec="--exec=$1"
+	exec="--upload-pack=$1"
+	shift;;
+  -u=*|--u=*|--up=*|--upl=*|--uplo=*|--uploa=*|--upload=*|\
+  --upload-=*|--upload-p=*|--upload-pa=*|--upload-pac=*|--upload-pack=*)
+	exec=--upload-pack=$(expr "$1" : '-[^=]*=\(.*\)')
 	shift;;
   --)
   shift; break ;;