The same change has already been applied on the 1.5 branch. The problems
(i.e. ifconfig not showing IP addresses) have been verified to still exist
with the new toolchain.
paths relative to ${.CURDIR} instead. Using BSDSRCDIR here means that
it's impossible to compile these programs out of the source tree they're
a part of, unless that sort tree happens to be the one at BSDSRCDIR.