Log Message:
For subtle reasons, expand ${WRKSRC} into ${WRKDIR}/${DISTNAME} in
RCD_SCRIPT_SRC.spamd definition.  The reason is that WRKSRC isn't defined
by the time we get down to bsd.pkg.install.mk, so the dependency logic
replaces "${WRKSRC}" with "", which is wrong.

XXX bsd.pkg.install.mk should really be included by bsd.pkg.mk, in much the
XXX same way bsd.buildlink2.mk is included by bsd.pkg.mk.  It would remove
XXX these ordering problems with variables not being available.