The program function in depend blocks is now able to search paths by
itself. If passed multiple arguments or multiple calls, at least one of
the arguments passed must be a program or a shell builtin (eg ip built
into busybox). If a qualified path is specified, only that path will be
checked, otherwise it will be checked as a builtin, then $PATH will be
checked for the named binary (via type).
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
