Moved inttypes.h from common/ to pic/common to resolve conflict on AVR builds with
conflicting inttypes.h from avr-libc. This Problem seem to evolve with newer versions
of the avr-libc. Problem occurs, if common/inttypes.h is found before inttypes.h from
avr-libc. It may give many different errors for avr projects, e.g. "undefined types"
uint??_farptr_t and also "conflicting type" for uint??_t.

Signed-off-by: Stefan Langer <vscp@datenheim.de>