Compilation fix for wxMSW with wxUSE_MSGBOX_HOOK==0.

Include wx/fontutil.h unconditionally, it's needed outside message box hook
code.

Closes #15395.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74643 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775