Import v3.1.1
Merge tag 'v3.1.1'

This is xerces-c v3.1.1

Conflicts:
	Makefile.in
	config.h.in
	config/config.guess
	config/config.sub
	config/ltmain.sh
	configure
	configure.ac
	m4/xerces_curl_prefix.m4
	m4/xerces_icu_prefix.m4
	samples/Makefile.in
	src/Makefile.in
	tests/Makefile.in

Regenerated configure and Makefile.in files
using Starlink autoconf. Used v3.1.1 versions
of m4 and config/ files.