maint: use libdir for .oct files, not libexecdir From Orion Poplawski <orion@cora.nwra.com>. * configure.ac (octlibdir): Use octave/$(version), not octave-$(version). (octfiledir): Use $(libdir), not $(libexecdir). (localoctfiledir): Likewise. (localapioctfiledir): Likewise. (localveroctfiledir): Likewise. * pkg.m: Use libdir instead of libexecdir as needed.