Fix patch so that it refers to $(TCAPLIB) and doesn't hardcode "-ltermcap".
Now the only time that libslang.so links against libtermcap.so only when
we're using termcap.  In the case where we don't, libslang.so includes
its own terminfo database parser, so we don't need to link against any
curses or other terminfo library.

Bump the PKGREVISION to 7.

(jlam)