MFC r269306:
  Add new rule to source address selection algorithm. It prefers address
  with better virtual status. Use ifa_preferred() to choose better address.

PR:		187341
MFC  r268300 r268541 r268544 r268565 r269775 r269838 r269839 r269840
     r269842 r269844 r269899:

BSD make support for generating and compiling USDT DTrace probes.