[patch] AVR: Add divsq3, udivusq3 to libgcc

[Georg-Johann Lay]

This patch adds the last fixed-point arithmetics that were still
missing from the avr backend, which are SQmode and USQmode divisions.

Ok for trunk?

Johann

--

libgcc/
        * config/avr/t-avr (FUNCS_notiny): Add _divsq3, _udivusq3.
        * config/avr/lib1funcs-fixed.S (__udivusq3, __divsq3): New DEFUN.
        (__usdivusq3, __ssdivsq3): New ENTRY.