Apply paxed's DEBUG patch to remove DEBUG/D_DEBUG.

Move debugging output into couple preprocessor defines, which
    are no-op without DEBUG.  To show debugging output from a
    certain source files, use sysconf:

    DEBUGFILES=dungeon.c questpgr.c

    Also fix couple debug lines which did not compile.

This also includes fixes due to Derek Ray to depugpline to work better
on other platforms.

include/global.h

@@ -11,6 +11,8 @@
 
 #define BETA		/* development or beta testing [MRS] */
 
+#define DEBUG
+
 /*
  * Files expected to exist in the playground directory.
  */