Fix download URL on "ftp.fu-berlin.de".
Changes 1.7.69:
* Check for NULL return from malloc().
* Undefine CLOCKS_PER_SECOND "1000" found in some version of MinGW.
* Replaced most "atoi(argv[++i])" with "pngcrush_get_long" which does
    "BUMP_I; strtol(argv[i],ptr,10)" and added pngcrush_check_long macro
    to detect malformed or missing parameters (debian bug 716149).
* Added global_things_have_changed=1 when reading -bkgd.
* The "-bit_depth N" option did not work reliably and has been removed.
Updated graphics/pngcrush to 1.7.69
+ Mesa-9.2.3, MesaLib-9.2.3, at-spi2-2.10.2, calibre-1.11, etm2-2.3.7
  [etm successor], glu-9.2.3, py-gobject3-3.10.2, vlc2-2.1.1,
  webkit-gtk-2.2.2.
Pass "-P" flag to CVS to avoid unnecessary surprises.
This way command is consistent with chapter on fetching.
(We should reference that chapter, actually.)
regen
Restore fragment from patch-dg that deals with not using
pthread_setspecific with a deleted key.
Don't add GCC hacks for Clang.
Fix GNU make version comparison logic.