Qt4 - Remove QFontDialog Dependency... We don't have some CONFIG_ITEM_FONT yet... Do we have complete fontconfig support btw ?

Qt4 - Windows registry manipulation. Create the good HKEY where there should be, even if the installer didn't do it.

Fix RC compilation, and OSD from C++ code in the process.

it did not work properly (proper check is impossible without blocking)

- Don't undef off_t twice.

Remove the sys/socket.h check. We don't really use it anyway, and socket calls have to be somewhere anyway

Reverts [24530] & [24531] (preprocessing related) , add $(DEFS) (-DHAVE_CONFIG_H) to moc command line

Qt4 - Basic implementation of the extensions. Seem to work :D Just .avi now, because we have no good list of extensions in the source code... :D
Ref #763