Perform the s,rm,/bin/rm, fix-up properly. No more kludge.

Perform the s,rm,/bin/rm, fix-up properly. No more kludge.

* Makefile.am (EXTRA_DIST): Remove .kludge-stamp.
(.kludge-stamp): Remove rule.  Instead, ...
(dist-hook): Do the job here, operating on the file in $(distdir).
(rm_subst): Adjust regexp to match "rm -f rm$(EXEEXT)", not "rm -f rm".
(MAINTAINERCLEANFILES): s/+=/=/, now that this is the sole use.
(dist-hook): Remove the legacy-from-cvs install-sh is-executable check.
* .gitignore: Remove .kludge-stamp.

Signed-off-by: Jim Meyering <jim@meyering.net>