musics: Separate out configuration for FreeDM.

FreeDM's levels should have different music to Freedoom (#10). Look
for MIDI files named D_DM?? to use for the levels.

For now this unfortunately means that the FreeDM levels are currently
lacking any music, as they're now all using the dummy (empty) MIDI
file. But hopefully that can be remedied soon ...

buildcfg.txt

@@ -491,6 +491,11 @@ D_BUNNY
 #else  /* #ifndef DOOM2 */
 
 ; doom 2 music
+D_READ_M
+D_DM2TTL
+D_DM2INT
+
+#ifndef FREEDM
 
 D_RUNNIN
 D_STALKS
@@ -526,8 +531,45 @@ D_EVIL
 D_ULTIMA
 D_READ_M
 D_DM2TTL
-D_DM2INT
 
+#else /* FREEDM */
+
+; FreeDM has different music:
+
+D_RUNNIN = D_DM01
+D_STALKS = D_DM02
+D_COUNTD = D_DM03
+D_BETWEE = D_DM04
+D_DOOM   = D_DM05
+D_THE_DA = D_DM06
+D_SHAWN  = D_DM07
+D_DDTBLU = D_DM08
+D_IN_CIT = D_DM09
+D_DEAD   = D_DM10
+D_STLKS2 = D_DM11
+D_THEDA2 = D_DM12
+D_DOOM2  = D_DM13
+D_DDTBL2 = D_DM14
+D_RUNNI2 = D_DM15
+D_DEAD2  = D_DM16
+D_STLKS3 = D_DM17
+D_ROMERO = D_DM18
+D_SHAWN2 = D_DM19
+D_MESSAG = D_DM20
+D_COUNT2 = D_DM21
+D_DDTBL3 = D_DM22
+D_AMPIE  = D_DM23
+D_THEDA3 = D_DM24
+D_ADRIAN = D_DM25
+D_MESSG2 = D_DM26
+D_ROMER2 = D_DM27
+D_TENSE  = D_DM28
+D_SHAWN3 = D_DM29
+D_OPENIN = D_DM30
+D_EVIL   = D_DM31
+D_ULTIMA = D_DM32
+
+#endif /* #ifdef FREEDM */
 #endif /* #ifndef DOOM2 */
 
 ; List of Pictures (with insertion point)