install-sh: Update to newer upstream versions (associated with aclocal 1.7).

2003-07-20  Phil Edwards  <pme@gcc.gnu.org>

	* install-sh:  Update to newer upstream versions (associated with
	aclocal 1.7).
	* mkinstalldirs:  Likewise.
	* missing:  Likewise, plus $1Help2man -> $1 typo fix.

From-SVN: r69608