Update xemacs to 21.4.15. Approved by uebayasi@.

Changes in this version:
 	* etc/OXYMORONS: Inserted "Corporate Culture" for 21.4.15.
	* etc/package-index.LATEST.gpg: New, replaces
	`package-index.LATEST.pgp'.
	* etc/package-index.LATEST.pgp: Removed, replaced with
	`package-index.LATEST.gpg'.
	* configure.in: The icc compiler pretends to be gcc.  It isn't.
	* etc/PACKAGES (ERC): new.
	* configure.usage (--with-widgets): widgets now defaults to
	--with-widgets=no.  Patch inspired by Jim Schumacher.
	* etc/PACKAGES (riece): New package.
	* etc/PACKAGES (liece): Mark as deprecated.
	* configure.in: Add Intel C++ compiler detection to compiler
	version reporting.
	* configure.in: record additional info about compiler and libc
	versions, to assist in debugging.
	* configure.in (line 3573):
	(Mule input methods):
	Deprecate Motif for Linux.
	(Installation): Report when LessTif is used.
	* configure.in: installexe.sh is under srcdir, not blddir.
	* aclocal.m4: Add icc (Intel compiler) support.
	* configure.in: Ditto.
	* configure.in (OS_RELEASE): Add support for SunOS 5.10.
	On current OSes produced by Sun, `uname -r' prints "5.9".
	It seems likely that on future OSes, `uname -r' will print "5.10".
	We need to accept multi-digit release numbers.
	* PROBLEMS: Propose bash as an alternative to buggy Solaris
	/bin/sh.
	* configure.in: XEmacs failed to build on Solaris9.

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