79729: Generate a single EV_TXEMPTY when the TX buffer turns empty

[buildbot at kegel.com]

This is an experimental automated build and test service.
Please feel free to ignore this email while we work the kinks out.

For more info about this message, see http://wiki.winehq.org/BuildBot

The Buildbot has detected a failed build on builder runtests-default while building Wine.
Full details are available at: http://buildbot.kegel.com/builders/runtests-default/builds/93 (though maybe not for long, as I'm still reinstalling the buildbot periodically while experimenting)
BUILD FAILED: failed shell_2

Errors:
serial.c: In function 'get_irq_info':
serial.c:814: error: 'we' undeclared (first use in this function)
serial.c:814: error: (Each undeclared identifier is reported only once
serial.c:814: error: for each function it appears in.)
serial.c:814: error: expected ';' before 'perfered'
At top level:
cc1: error: unrecognized command line option "-Wno-unused-but-set-parameter"
cc1: error: unrecognized command line option "-Wno-unused-but-set-variable"
make[1]: *** [serial.o] Error 1
make: *** [dlls/ntdll] Error 2