windows: Compile printf.c for the msvc port.

This provides the DEBUG_printf definition which is needed when
defining MICROPY_DEBUG_VERBOSE, and is consistent with all other ports.

Signed-off-by: stijn <stijn@ignitron.net>

Author: stinos

ports/windows/micropython.vcxproj

@@ -87,6 +87,7 @@
   <ItemGroup>
     <ClCompile Include="@(PyCoreSource)" />
     <ClCompile Include="@(PyExtModSource)" />
+    <ClCompile Include="$(PyBaseDir)shared\libc\printf.c" />
     <ClCompile Include="$(PyBaseDir)shared\readline\*.c" />
     <ClCompile Include="$(PyBaseDir)shared\runtime\gchelper_generic.c" />
     <ClCompile Include="$(PyBaseDir)shared\runtime\pyexec.c" />