The MSP430 target supports both 16-bit and 20-bit size_t and intptr_t.
Some implicit casts in Newlib expect these types to be
"long", (a 32-bit type on MSP430) which causes warnings during
compilation such as:
  "cast from pointer to integer of different size"

Successfully regtested the GCC and G++ testsuite for msp430-elf in the
default, -mlarge, -mcpu=msp430 and
-mlarge/mcode-region=either/-mdata-region=either configurations.
These fixes don't actually change any of the testresults.

If the patch is acceptable, I would appreciate if someone would commit
it for me, as I do not have write access.

Thanks,
Jozef