[MacPorts] #17956: Fixes to make system_x11 variant work better

[MacPorts]

#17956: Fixes to make system_x11 variant work better
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 Reporter:  mta@…          |       Owner:  macports-tickets@…                                                                                                                                                                                                                           
     Type:  defect         |      Status:  new                                                                                                                                                                                                                                          
 Priority:  Normal         |   Milestone:  Port Updates                                                                                                                                                                                                                                 
Component:  ports          |     Version:  1.8.0                                                                                                                                                                                                                                        
 Keywords:                 |        Port:  bitmap, editres, oclock, viewres, xcalc, xclipboard, xclock, xconsole, xditview, xdm, xedit, xfd, xfontsel, xgc, xload, xlogo, xmag, xman, xmessage, xmh, xmore, xsm, mesa, xorg-libAppleWM, xrender, fslsfonts, appres, listres, luit, xeyes
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 I just upgraded my machine and in the process rebuilt all my ports from
 scratch.  I decided to use the new system_x11 variant where available and
 in the process discovered a few problems.

 There were a few ports (mesa, xorg-libAppleWM, and xrender) that wouldn't
 build with that variant unless they had first been built without it and
 not cleaned since then.  The first patch attached fixes these.

 There were a number of other ports (22 in all) that didn't have a
 system_x11 variant, but needed one since they install something in app-
 defaults.  If the X11 libraries are built with system_x11, they try to
 install these files in /usr/X11/lib/X11/app-defaults which of course
 doesn't work.  The second patch fixes these ports.

 While I was at it I added a system_x11 variant to 5 other ports for which
 it seemed to make sense.  This patch is the third patch below.

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Ticket URL: <http://trac.macports.org/ticket/17956>
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