Teach Windows build about new future.c.
diff --git a/PCbuild/pythoncore.dsp b/PCbuild/pythoncore.dsp
index 1b8e68f..70f45e5 100644
--- a/PCbuild/pythoncore.dsp
+++ b/PCbuild/pythoncore.dsp
@@ -690,6 +690,21 @@
# End Source File
# Begin Source File
+SOURCE=..\Python\future.c
+
+!IF "$(CFG)" == "pythoncore - Win32 Release"
+
+!ELSEIF "$(CFG)" == "pythoncore - Win32 Debug"
+
+!ELSEIF "$(CFG)" == "pythoncore - Win32 Alpha Debug"
+
+!ELSEIF "$(CFG)" == "pythoncore - Win32 Alpha Release"
+
+!ENDIF
+
+# End Source File
+# Begin Source File
+
SOURCE=..\Modules\gcmodule.c
!IF "$(CFG)" == "pythoncore - Win32 Release"