XDEV: Add WITH_DEBUG=y for any mips64 build.  Strip is broken for this arch and hasn't been fixed in head/release.
XDEV: Remove path munging as the nxb-bin native-xtools toolchain does not link correctly in a lot of cases.
XDEV: Don't replace /sbin/sysctl as we need to emulate it to catch sysctl's and translate/override them in our emulator.
XDEV: Setup env with MACHINE/MACHINE_ARCH based on the -a arguments to make bmake realize that its cross building.  Tested on builds of math/fftw3
Merge remote-tracking branch 'origin/pr/246' into release-3.1

* origin/pr/246:
  XDEV: Setup env with MACHINE/MACHINE_ARCH based on the -a arguments to make bmake realize that its cross building.  Tested on builds of math/fftw3
  XDEV: Don't replace /sbin/sysctl as we need to emulate it to catch sysctl's and translate/override them in our emulator.
  XDEV: Remove path munging as the nxb-bin native-xtools toolchain does not link correctly in a lot of cases.
  XDEV: Add WITH_DEBUG=y for any mips64 build.  Strip is broken for this arch and hasn't been fixed in head/release.