[Predef-contribute] ARM gcc thumb define

[Erik Faye-L. <Eri...@ar...>]

Gcc defines __thumb__ when compiling code for the thumb instruction set
for ARM cpus (ie when using the -mthumb switch). __arm__ is defined
regardless of instruction set (ie both when setting -marm and -mthumb).
This was tested both using devkitPro (http://www.devkitpro.org) and
codesourcery g++(http://www.codesourcery.com/gnu_toolchains/arm/).

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