Patch from James H to enable a single monolithic binary to be built

alongside the individual puzzle binaries, on Windows only. (MacOS
already has it, of course; Unix would require about as much work
again.)

[originally from svn r8396]

Recipe

@@ -17,8 +17,9 @@
 
 !srcdir icons/
 
-WINDOWS  = windows printing
+WINDOWS_COMMON = printing
          + user32.lib gdi32.lib comctl32.lib comdlg32.lib winspool.lib
+WINDOWS  = windows WINDOWS_COMMON
 COMMON   = midend drawing misc malloc random version
 GTK      = gtk printing ps
 # Objects needed for auxiliary command-line programs.
@@ -56,6 +57,8 @@ const int gamecount = lenof(gamelist);
 # Unix standalone application for special-purpose obfuscation.
 obfusc : [U] obfusc STANDALONE
 
+puzzles  : [G] windows[COMBINED] WINDOWS_COMMON COMMON ALL noicon.res
+
 # Mac OS X unified application containing all the puzzles.
 Puzzles  : [MX] osx osx.icns osx-info.plist COMMON ALL
 # For OS X, we must create the online help and include it in the