Fixed build warnings that didn't require thought

The remaining warnings require a bit more thought before they're simply
hacked around.

aprx.c:	62,271,328	Ignoring result of function call
beacon.c: 1230 	Ignoring result of function call
netax25.c: 716	Ignoring result of function call
igate.c: 504,505	Unused variables that seem important
Merge remote-tracking branch 'upstream/master'