Actually introduce the ability to build the Windows icons into the

Windows puzzle binaries. This checkin involves several distinct
changes:
 - mkfiles.pl now has an extra feature: if an object file is listed
   in Recipe with a trailing question mark, it will be considered
   optional, and silently dropped from the makefile if its primary
   source file isn't present at the time mkfiles.pl runs. This means
   people who check out the puzzles from Subversion and just run
   mkfiles.pl shouldn't get build failures; they just won't get the
   icons.
 - all the .R files now use this feature to include an optional
   Windows resource file.
 - the .rc resource source files are built by icons/Makefile.
 - windows.c finds the icon if present and uses it in place of the
   standard Windows application icon.

[originally from svn r7020]

1 files changed, 2 insertions, 0 deletions

diff --git a/Recipe b/Recipe
index c946a8d..42618eb 100644
--- a/Recipe
+++ b/Recipe
@@ -13,6 +13,8 @@
 !makefile cygwin Makefile.cyg
 !makefile osx Makefile.osx
 
+!srcdir icons/
+
 WINDOWS  = windows printing
          + user32.lib gdi32.lib comctl32.lib comdlg32.lib winspool.lib
 COMMON   = midend drawing misc malloc random version