Windows 32-bit build failure: unreachable code

[Luke Benes]

Ever since:

https://cgit.freedesktop.org/libreoffice/core/commit/?id=cd6a441a77d1d34a79c928b54ae40a43fb09825b
Bin support for Visual Studio 2015, leaving just 2017 for now

Windows 32-bit builds fail with this error:

[build CXX] bridges/source/cpp_uno/shared/bridge.cxx
d:\core\bridges\source\cpp_uno\shared\component.cxx(124) : error C2220: warning treated as error - no 'object' file generated
d:\core\bridges\source\cpp_uno\shared\component.cxx(124) : warning C4702: unreachable code
[build CXX] bridges/source/cpp_uno/shared/vtablefactory.cxx
make[1]: *** [D:/core/solenv/gbuild/LinkTarget.mk:293: D:/core/workdir/CxxObject/bridges/source/cpp_uno/shared/component.o] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:286: build] Error 2

The 32-bit Windows tinderbox is also failing with a similar error.

-Luke