Update to version 1.5. Changes from 1.4 are:
o patch-aa has been incorporated into the distribution,
o the port and distribution can use an alternate source
tree by setting SRCDIR (defaults to /usr/src),
o depends on linux_devtools-7 instead of linux_devtools-6.
Alternate source tree courtecy of:
PR: ports/42649
Submitted by: jhein at timing dot com