3447. [port] Add support for libxml2-2.9.x [RT #32231]

CHANGES

+3447.	[port]		Add support for libxml2-2.9.x [RT #32231]
+
 3446.	[port]		win32: Add source ID (see change #3400) to build.
 			[RT #31683]
 

configure

@@ -15707,7 +15707,7 @@ case "$use_libxml2" in
 		;;
 	auto|yes)
 		case X`(xml2-config --version) 2>/dev/null` in
-		X2.[678].*)
+		X2.[6789].*)
 			libxml2_libs=`xml2-config --libs`
 			libxml2_cflags=`xml2-config --cflags`
 			;;

configure.in

@@ -1356,7 +1356,7 @@ case "$use_libxml2" in
 		;;
 	auto|yes)
 		case X`(xml2-config --version) 2>/dev/null` in
-		X2.[[678]].*)
+		X2.[[6789]].*)
 			libxml2_libs=`xml2-config --libs`
 			libxml2_cflags=`xml2-config --cflags`
 			;;