Gcc arm fix for USB device library#2

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pbrier wants to merge 2 commits intoARMmbed:masterfrom

Commits on Apr 6, 2013

Added __packed macro to be compatible with GCC compiler, in order to build USB libs with GCC_ARM
pbrier
committed

Commits on Apr 11, 2013

Fix for USB device compiling with GCC toolchain, adding __packed macro in toolchain.h, and including toolchain.h in mbed.h
pbrier
committed