Log Message:
+ Honor PKGINFODIR in mysql4-client.

+ Remove explicit naming of "-lncurses -ltermcap" as the way to get
  the termcap libraries.  Including termcap.buildlink3.mk (indirectly
  through including readline/buildlink3.mk) will do the right thing.

+ Remove readline dependency from Makefile.common and add it into
  mysql4-client/Makefile.  Only the -client package needs and uses
  readline.  The -server package only "needs" it to placate the
  configure script, but none of its installed binaries are linked
  against it.

+ Add full DESTDIR support to the -client and -server packages.

Bump the PKGREVISION of mysql4-client to 3.

The PKGREVISION of mysql4-server remains unchanged since there are
no user-visible changes to the binary package.