Try to make it easier for when I update the build script template.

Try to make it easier for when I update the build script template.

It's most likely incredibly hacky, but this changeset gives a pkgusr a way
to incrementally and interactively apply updates to their build script
when the central template script in /etc/pkgusr/skel-package is updated.

If the central template script is newer than the pkgusr's a notice is
printed to their stdout on login that contains further instructions of how
to proceed.

The actual updating is done via #'ediff-files in an interactive SXEmacs
session.  That way the pkgusr can "cherrypick" the changes.

	* lisp/bld-update.el: New.  Update build scripts via ediff.

	* etc/pkgusr/handy_funcs (build-update): New.  Calls SXEmacs with
	ediff-files on ~/build and /etc/pkgusr/skel-package/build
	(checkupdates): Checks to see if the build script in
	/etc/pkgusr/skel-package is newer than the one in $HOME

	* etc/pkgusr/bash_profile (CHECKUPDATES): New.

Signed-off-by: Steve Youngs <steve@sxemacs.org>