minor Makefile tweaks
minor Makefile tweaks

 - enabled GCC ARM Embedded newlib-nano (introduced in arm-gcc 4.7)
 - add lpcrc as dependency of firmware (needed to provide crc for .bin)
 - remove bin/firmware.map with make clean
 - removed trailing spaces on lots of lines

tummychow/arm-alarm,tummychow/arm-alarm,tummychow/arm-alarm,tummychow/arm-alarm