Neither MinGW or Cygwin versions of winerror.h work if used alone, so on either of these platforms include the full windows.h. Move reporting of configuration to a separate config_test.cpp program, and expand the coverage to report more macros.

include/boost/system/windows_error.hpp

@@ -18,7 +18,15 @@
 #ifdef BOOST_WINDOWS_API
 
 #include <boost/system/error_code.hpp>
+
+// Neither MinGW or Cygwin versions of winerror.h work if used alone, so on
+// either of those platforms include the full windows.h
+
+#if defined(__MINGW32__) || defined(__CYGWIN__)
+#include <windows.h>
+#else
 #include <winerror.h>
+#endif
 
 namespace boost
 {