Build msp430-specific libnosys

The MSP430 debuggers support I/O on hardware through CIO, so
we can use a CIO-enabled library as the "nosys" library (in
addition to the libsim library, which talks to our simulator)

* configure.in: Don't build default libnosys for msp430
* configure: Regenerate.
* msp430/Makefile: Rename libcio to libnosys.

libgloss/configure

@@ -2548,6 +2548,7 @@ case "${target}" in
   msp430*-*-elf)
 	subdirs="$subdirs msp430"
 
+	config_libnosys=false
 	;;
   rl78*-*-elf)
 	subdirs="$subdirs rl78"