Update msp430 toolchain to new version:
mspgcc release 20110716:
msp430mcu-20110613 (new port, platform headers, converted from offical TI
ones and linking scripts, generated from datasheets).
Preserve old msp430-gcc as `devel/msp430-gcc3'
Make mps430-libc work with both gcc versions.
Add CONFLICTS to msp430-gcc*.
Add LICENSE clauses to all FSF-based ports.