Revert "submodules: fix ambiguous absolute paths under Windows"

This reverts commit 4dce7d9b40,
which was originally done to help Windows but was almost
immediately reverted in msysGit, and the codebase kept this
unnecessary divergence for almost two years.

Signed-off-by: Stepan Kasal <kasal@ucw.cz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-submodule.sh

@@ -285,9 +285,6 @@ module_clone()
 	# resolve any symlinks that might be present in $PWD
 	a=$(cd_to_toplevel && cd "$gitdir" && pwd)/
 	b=$(cd_to_toplevel && cd "$sm_path" && pwd)/
-	# normalize Windows-style absolute paths to POSIX-style absolute paths
-	case $a in [a-zA-Z]:/*) a=/${a%%:*}${a#*:} ;; esac
-	case $b in [a-zA-Z]:/*) b=/${b%%:*}${b#*:} ;; esac
 	# Remove all common leading directories after a sanity check
 	if test "${a#$b}" != "$a" || test "${b#$a}" != "$b"; then
 		die "$(eval_gettext "Gitdir '\$a' is part of the submodule path '\$b' or vice versa")"