Building QtCreator fails with MinGW and BUILD_WITH_PCH=OFF

Building QtCreator fails with MinGW and BUILD_WITH_PCH=OFF: FILE_ID_INFO is used by devicefileaccess.cpp, but not defined. This is because FILE_ID_INFO is Window 8 API, but MinGW assumes Windows 7 API by default. With BUILD_WITH_PCH=ON Windows 8 mode is enabled. This also needs to be done for builds without precompiled headers. Disabling precompiled headers is useful to make CCache work.

Possible fix that I am testing right now:

diff --git a/cmake/QtCreatorAPIInternal.cmake b/cmake/QtCreatorAPIInternal.cmake
index 9a6f06b73e..27ebbf2fb4 100644
--- a/cmake/QtCreatorAPIInternal.cmake
+++ b/cmake/QtCreatorAPIInternal.cmake
@@ -31,7 +31,10 @@ if (WIN32)

   if (NOT BUILD_WITH_PCH)
     list(APPEND DEFAULT_DEFINES
-      WIN32_LEAN_AND_MEAN)
+      WIN32_LEAN_AND_MEAN
+      WINVER=0x0602
+      _WIN32_WINNT=0x0602
+    )
   endif()
 endif()