Remove use of the DUMMYUNIONNAME macro from our definitions of
internal winapi anonymous unions. This macro was added to
winternl.h in Windows SDK v7.0a in combination with a conditional
definition of DUMMYUNIONNAME to either empty or `u` depending on
compiler support. libuv doesn't support any compilers that lack
anonymous unions, but does support compilers such as VS 2008 that
complain about the presence of the DUMMYUNIONNAME identifier on an
anonymous union because their winapi headers do not define the
macro publicly.
PR-URL: https://github.com/libuv/libuv/pull/1090
Reviewed-By: João Reis <reis@janeasystems.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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