Update x48 from version 0.4.1 to 0.6.4.

Pkgsrc changes;
* HOMEPAGE & distribution site moved.
* HP has released the ROMs, and copies of these are now automatically
  installed.
* I could not get the X11 shm option to work (native X11, NetBSD 6.1/i386),
  so it is disabled in the Makefile.
* Patch with updated pty handling code, borrowing some from FreeBSD's
  package here.

Upstream changes:
2011-08-08 "G. Allen Morris III" <gam3@gam3.net> release 0.6.4
  * Default to throttling speed only when key-pressed
  * Add throttle switch for speed emulation
  * Fix buffer overflow bug
  * release keys on loss of focus
  * typo in access_time adjust

2010-02-01 "G. Allen Morris III" <gam3@gam3.net> release 0.6.3
  * made updates to x48.spec
  * put debian directory in dist file
  * install X48 app data in correct place
    using pkg-config appdefaultdir xt
  * removed more debugging messages
  * added 'netbook' look for small/short screens
    use +netbook on the command line

2010-01-30 "G. Allen Morris III" <gam3@gam3.net> release 0.6.2
  * remove setlocal code that was causing a bug.
  * removed some debugging code.

2009-06-31 "G. Allen Morris III" <gam3@gam3.net> release 0.6.1
  * Fix to XShm to solve the 'LCD' Scramble problem.

2006-04-20 "G. Allen Morris III" <gam3@gam3.net>
  * Added simple paste feature
  * Repaired debugger non-readline input
  * Changed from building with Imakefile to using GNU autoconfig

2005-03-20 "G. Allen Morris III" <gam3@gam3.net>
  * added equal key for + and Meta Keys for Alpha
  * applied a different fix for the arrow repeat key bug
  * fixed a bug in the timer one logic.  The cursor now flashes on input.

2005-03-20 "G. Allen Morris III" <gam3@gam3.net>
  * added patch [000390] time.h compile bug
  * added patch [000391] Arrow key repeat patch
  * added ChangeLog file

2005-03-18 "G. Allen Morris III" <gam3@gam3.net>
  * starting from x48 0.4.0.

(he)