[PATCH] Support __int20__ type in _intsup.h

[Jozef Lawrynowicz]

A new patch to GCC (r272640) modifies the MSP430 target to use "__int20__" for
PTRDIFF_TYPE (and therefore INTPTR_TYPE) instead of "__int20".

To support the calculation of pointer size in
newlib/libc/include/sys/_intsup.h, definitions for __int20__ need to be added.

Patch is attached.

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

Thanks,
Jozef
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