Fix build failure reported in the kdesvn-build 1.7 release. Someday I'll have the time to do better testing, but this is still a fairly embarrassing bug to make it to a release. :(

Guess I should heed the motto of "Slow is Fast" and stop rushing myself.

The cause of the bug was moving around the definition of $script. Later code in the function (inappropriately) used the value of $script which used to coincidentally be correct.

As a bonus though the debugging for this also uncovered a long-hidden bug in the venerable get_option subroutine which would cause qt-copy's configure to fail if the configure-flags were empty.

Also persistent option reading is given a sane default, which should hopefully fix the other build failures.