Import avr-gdb-7.6 as wip/avr-gdb.

GNU Debugger GDB, configured for Atmel AVR microcontroller targets.

This debugger cannot really be used standalone, but is useful in
connection with either AVaRICE (http://avarice.sourceforge.net/)
or simulavr (http://www.freesoftware.fsf.org/simulavr/).