Find python-avro build dir even if it has an arch suffix.
Find python-avro build dir even if it has an arch suffix.

Byhiras/pyavroc,Byhiras/pyavroc,walshb/pyavroc,crs4/pyavroc,Byhiras/pyavroc,walshb/pyavroc,walshb/pyavroc,Byhiras/pyavroc,crs4/pyavroc,walshb/pyavroc,crs4/pyavroc