Maple USB CDC-ACM firmware is non-functional when built with bleeding edge GCC

[bnewbold]

This is with very recent versions of arm-none-eabi-gcc and arm-none-eabi-newlib under Arch Linux circa May 2015. Build is successful and firmware loads and runs, but USB fails to enumerate properly on multiple machines. With identical firmware built under older (2014) GCC and newlib, USB enumerates fine on multiple machines (including Arch test machine).

But hey, at least this software is packaged now!