Re-ran indent on all .c & .h source code files

Like so --
  find . -name "*.c" -or -name "*.h" -exec  indent -nbfda -npcs -npsl -bli0 --no-tabs {} \;

The `indent` invocation differs from the last one noted in
CHANGES.txt (from 2006!?), in that I've added "--no-tabs",
to ensure indents are all space-based.

src/playsound.h

@@ -37,6 +37,7 @@
 extern Mix_Chunk *sounds[NUM_SOUNDS];
 extern int mute, use_sound, use_stereo;
 
-void playsound(SDL_Surface * screen, int chan, int s, int override, int x, int y);
+void playsound(SDL_Surface * screen, int chan, int s, int override, int x,
+               int y);
 
 #endif