Add support for LynxOS 5.x and LynxOS 178.

ChangeLog:

        * config.sub (*-lynx*178, *-lynx*5): New.
        * testsuite/config-sub.data: Add powerpc-elf-lynxos,
        powerpc-elf-lynxos5, powerpc-xcoff-lynxos178 testing.

Signed-off-by: Ben Elliston <bje@gnu.org>

config.sub

@@ -4,7 +4,7 @@
 #   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #   2011, 2012 Free Software Foundation, Inc.
 
-timestamp='2012-02-10'
+timestamp='2012-04-18'
 
 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -225,6 +225,12 @@ case $os in
 	-isc*)
 		basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
 		;;
+	-lynx*178)
+		os=-lynxos178
+		;;
+	-lynx*5)
+		os=-lynxos5
+		;;
 	-lynx*)
 		os=-lynxos
 		;;