Log Message:
cad/qcad: Build and install libqcadscripts

Despite not causing a failure to build and package, qcad's build was
failing to find libqcadcore while building libqcadscripts.  This
commits adds a patch, similar to many others already present, that
adds -L ../core and then installs the library (and then the expected
PLIST change).

It remains a mystery why the build ever worked; the makefile I get
seems to ignore the failed build, which seems wrong.  The bulk builds
have worked.  But Mustafa reports a build failure, and I find that
failure in my log, even if it is non-fatal.

Reported by Mustafa Dogan.