PR ld/15762
	PR ld/12761
	* elflink.c (elf_link_add_object_symbols): Don't clobber
	.gnu.warning.symbol sections when shared.
	* Makefile.in (cygwin-ug-net/cygwin-ug-net.pdf): Process input via
	xsltproc and fop.
	(cygwin-api/cygwin-api.pdf): Ditto.
	* fo.xsl: New file.
* exceptions.cc (signal_exit): Nope.  Nevermind.  Dump core unconditionally.
* exceptions.cc (signal_exit): Remove comment.  Use __builtin_frame_address.
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