Fix MinGW build regression issue.

CMake/Modules/Urho3D-CMake-common.cmake

@@ -82,6 +82,7 @@ if (MINGW AND NOT DEFINED URHO3D_SSE)
     execute_process (COMMAND ${CMAKE_C_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION ERROR_QUIET)
     if (GCC_VERSION VERSION_LESS 4.9.1)
         message (WARNING "Disabling SSE by default due to MinGW version. It is recommended to upgrade to MinGW with GCC >= 4.9.1. You can also try to re-enable SSE with CMake option -DURHO3D_SSE=1, but this may result in compile errors.")
+        set (URHO3D_DEFAULT_SSE FALSE)
     else ()
         set (URHO3D_DEFAULT_SSE TRUE)
     endif ()