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Patch from James H: make the Windows debugging output conditional on
an enabling environment variable.

[originally from svn r8834]

--- a/windows.c

+++ b/windows.c

@@ -154,11 +154,17 @@

 {

     char buf[4096];

     va_list ap;

+    static int debugging = -1;

-    va_start(ap, fmt);

-    _vsnprintf(buf, 4095, fmt, ap);

-    dputs(buf);

-    va_end(ap);

+    if (debugging == -1)

+        debugging = getenv("DEBUG_PUZZLES") ? 1 : 0;

+

+    if (debugging) {

+        va_start(ap, fmt);

+        _vsnprintf(buf, 4095, fmt, ap);

+	dputs(buf);

+        va_end(ap);

+    }

 }

 #endif