Rearrange the getline() patch so it works on -current. (Unlike the usual
problem, here the package is trying to use the posix getline but the
compat for older systems broke.)

This should really be done with a configure test, but to regen the
configure script without creating a huge diff would require digging up
an ancient version of autoconf and for now at least it doesn't seem
worth the trouble.

(dholland)