Change to the handling of -DCOMBINED in the makefiles. Instead of

defining it centrally per port, I think it's neater to define it for
each puzzle when adding that puzzle to the ALL list - because those
front ends which take -DCOMBINED are precisely those which use ALL.
In particular, this change opens up the possibility of compiling
both individual puzzles _and_ a combined monolith within the same
makefile.

[originally from svn r8178]

osx.m

@@ -77,6 +77,8 @@
  *    recreate it.
  */
 
+#define COMBINED /* we put all the puzzles in one binary in this port */
+
 #include <ctype.h>
 #include <sys/time.h>
 #import <Cocoa/Cocoa.h>