games/prboom-plus: Updated for version 2.6.66.

Signed-off-by: B. Watson <urchlay@slackware.uk>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

games/prboom-plus/README

@@ -14,8 +14,10 @@ shareware doom1.wad) may be placed. The IWAD directory is
 /usr/share/games/doom. If you don't have any IWADs, install
 doom_shareware_data to play shareware Doom.
 
-Optional dependency, autodetected:
+Optional dependencies, autodetected:
 portmidi - for the PortMIDI backend. Most users won't need this.
+dumb - somehow, this can be used for music. No idea how to enable it,
+       but if dumb is detected, prboom-plus will link with it.
 
 *** NOTE ***
 
@@ -26,3 +28,8 @@ file that sets snd_midiplayer to "sdl", the music will sound *really*
 messed up. If this happens, simply edit ~/.prboom-plus/prboom-plus.cfg
 and remove the line containing snd_midiplayer. Or just delete the
 file, to start with default settings.
+
+If you don't like the sound of the OPL2 music, you can try using
+FluidSynth instead (Options -> General -> Preferred MIDI Player in the
+user interface). Other options (PortMIDI and ALSA) may be usable but
+will require more setup, outside the scope of this README.

games/prboom-plus/prboom-plus.SlackBuild

@@ -8,6 +8,9 @@
 # http://www.wtfpl.net/txt/copying/ for details.
 
 # 20230714 bkw: update for v2.6.66. SDL MIDI is still broken.
+# - change default fluidsynth soundfont to one that exists in Slackware.
+# - document optional dependency dumb.
+
 # 20220622 bkw: update for v2.6.2, add missing doinst.sh.
 
 # 20211027 bkw:
@@ -83,6 +86,11 @@ find -L .  -perm /111 -a \! -perm 755 -a -exec chmod 755 {} \+ -o \
 sed -i '/install/s,/bin,/games,' src/CMakeLists.txt
 sed -i '/^set(CMAKE_INSTALL_DOCDIR/d' CMakeLists.txt
 
+# 20230714 bkw: use a default soundfont that exists. allows choosing the
+# fluidsynth midi option. personally I think opl2 sounds better, but *shrug*.
+US="/usr/share"
+sed -i '/snd_soundfont/s,"'$US'[^"]*","'$US'/minuet/soundfonts/GeneralUser-v1.47.sf2",' src/m_misc.c
+
 MIXEROPT=ON
 if [ "${BANDAID:-yes}" = "yes" ]; then
   # 20211027 bkw: Band-aid. The game segfaults when the midi backend
@@ -91,6 +99,8 @@ if [ "${BANDAID:-yes}" = "yes" ]; then
   # backend to "opl2", which doesn't sound as nice, but allows the game
   # to run. Also it increases the default volume, since the opl2 synth
   # is quieter.
+  # 20230714 bkw: this is still needed for v2.6.66. the fault is in
+  # Slackware 15.0, so it's not going to change soon.
   MIXEROPT=OFF
   sed -i -e '/"snd_midiplayer"/s,"sdl","opl2",' \
          -e '/"music_volume"/s,8,12,' \