prboom-plus: Update games/prboom-plus to 2.5.1.4

Changes:
2.5.1.4  @ 2016-Jan-10
[+]  Added "Fix clipping problems in large levels" option.
[+]  Added "gl_finish" config variable.
[+]  Added "mus_fluidsynth_gain" and "mus_opl_gain cfg" config variables to
     fine tune output of fluidsynth and opl2 midi. Values allowed are 0 to
     1000. 50 (default) exactly matches old behavior.
[+]  Added a "Health Bar Above Monsters" option (health_bar* config variables).
[+]  Added a "Things appearance" automap option. Possible values: "classic",
     "scaled" and "icons".
[+]  Added "notarget" and "fly" cheat codes.
[+]  Added MBF's "-beta" codepointers.
[+]  Added a new HUD.
[+]  Added "shaders" sector light mode.
[+]  Support "Classic Doom" WAD files of Doom 3 BFG Edition, by Fabian
     Greffrath.
[+]  Support for HACX 1.2 IWAD, by Fabian Greffrath.
[+]  Support up to eight joystick buttons instead of just four, by Fabian
     Greffrath. The fifth and sixth buttons are mapped to strafe left and right.
[+]  Mouse look now is available in software mode.
[+]  Added a crosshair. Three different crosshair graphics are for choice:
     cross, angle and dot. Extra features are changing crosshair colors
     according to the player's health and/or on sight of a target.
[+]  Added "Allow Jump" option on "Prboom-plus 'bad' compatibility settings"
     page. Implemented by Fabian Greffrath.
[+]  Added a "Backpack Changes Thresholds" option.
[+]  -skipsec accepts a minutes prefix followed by a colon.
[+]  Two-key strafe50: StrafeOn + MoveLR = strafe50
[+]  Added "Allow Vertical Aiming" option on "Prboom-plus 'bad' compatibility
     settings" page.
[*]  Update to newest SDL libraries: SDL_mixer 1.2.12, SDL_image 1.2.12,
     SDL_net 1.2.8.
[*]  Brown color for weapons that cannot be fired on weapon HUD widget.
[*]  "Use GL surface for software mode" mode now works much faster if
     gl_finish is 0 in config.
[*]  process_affinity_mask config variable is removed. Single CPU core will be
     automatically forced if SDL MIDI player is used.
[*]  Better support for Chex Quest, by Fabian Greffrath. Embed chex.deh by
     fraggle in prboom-plus.wad.
[*]  Redo MBF-style multiple DEHACKED lumps. Load command line DeHackEd patches
     after DEHACKED lumps.
[*]  Improved rendering precision (wall wiggle), by kb1.
[*]  Realign automap grid with blockmap.
[-]  'Max Health', 'Max Soulsphere' and 'Megasphere Health' DEH parameters did
     not work after warping to level from command line since 2.4.8.1.
[-]  Buggy invulnerability effect if hi-res textures are used and there is no
     support for GL_ARB_framebuffer_object.
[-]  Simple shadows flicker during lowering lifts.
[-]  "Change palette on pain/bonus/power" settings did not work.
[-]  Lines of walls on automap were not displayed on Planisphere 2 at some zoom.
[-]  Fixed HOMs on Planisphere 2.
[-]  Incorrect clipping of automap in opaque mode after changing view window
     size. Affects only software mode.
[-]  Fixed long wall error.
[-]  Boom's ability to change floor and ceiling lighting independently was not
     applied to things in opengl.


(leot)