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snd_pitchshift defaults off, except Raven games

Tweak snd_pitchshift to clearly default to off and switch the
default to on only for Heretic and Hexen (since all versions of
Heretic and Hexen did pitch-shifting).

Pitch shifting was never implemented for Strife, so hide the option
in chocolate-strife-setup entirely.

--- a/src/setup/sound.c

+++ b/src/setup/sound.c

@@ -290,6 +290,14 @@

         num_music_modes = NUM_MUSICMODES - 1;

     }

+    // All versions of Heretic and Hexen did pitch-shifting.

+    // Most versions of Doom did not and Strife never did.

+

+    if(gamemission == heretic || gamemission == hexen)

+    {

+        snd_pitchshift = 1;

+    }

+

     // Build the window

     window = TXT_NewWindow("Sound configuration");

@@ -315,8 +323,15 @@

                    TXT_NewSpinControl(&numChannels, 1, 8),

                    TXT_NewLabel("SFX volume"),

                    TXT_NewSpinControl(&sfxVolume, 0, 15),

-                   TXT_NewCheckBox("Pitch-shift sounds", &snd_pitchshift),

                    NULL);

+

+    // strife did not implement pitch shifting at all, so hide the option.

+

+    if (gamemission != strife)

+    {

+        TXT_AddWidget(sfx_table,

+                   TXT_NewCheckBox("Pitch-shift sounds", &snd_pitchshift));

+    }

     if (gamemission == strife)

     {