header (C) fixes
Networking/VDE: patch by Renzo Davoli to fix ticket #7119
include,Config.kmk: Made the headers syntax check cleanly on linux.amd64 w/ gcc v4.3.4.
Devices/Network/VDE: applied "[vbox-dev] [PATCH] VirtualBox. vde_close was missing..." (07/05/2010, Renzo Davoli)
more manual Oracle rebranding in headers
FE/Qt, Devices: moved VDE plugin headers into include/VBox and enabled VDE in the GUI, but only if the plugin is found on the host (Linux and FreeBSD only)