Temporarily added targets for MSVC nmake plugins in network, sound and usb
sections. A better solution must be found for the basic set of device plugins
in iodev that don't require special rules.
Switched back to the original gui macro naming for linking plugins.


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12297 6c8e4198-a580-4521-a02f-c9ae86df1db9