#65 irsend fails to compile

[Alec Leamas]

On older platforms irsend.c fails to compile with the message "irsend.c:36: error: redifinition of typedef '__u32'"

This is due to a unnecessary, non-standard use of gcc. Nuke, we rely on that __u32 is available anyway.

Reported om a sidenote in [tickets:#8]

Fixed in [2a5df4]