Add support for the __aeabi_c*cmp* functions. These are similar to the
existing functions with the exception they use the condition flags to
store the result.

Differential Revision:	https://reviews.freebsd.org/D872
Silence from:	current@ and numerics@
MFC after:	1 week
Uncomment general options from the Pandaboard config. These are in other
configs and there is no reason for them not to be here.
Move memset under ifdef INET6.

MFH:		1 month
Reported by:	bz