Ted Mielczarek e0a932a9ba bug 1318143 - add support for detecting Visual Studio 2017 to configure. r=gps ...

This patch adds a copy of vswhere.exe to build/win32, downloaded from the
current latest release (1.0.62):
https://github.com/Microsoft/vswhere/releases/download/1.0.62/vswhere.exe

It changes toolchain.configure to invoke vswhere.exe instead of reading
the registry, since that no longer works for VS2017 (but vswhere can locate
VS2015). It also removes a layer of complexity in that code by dropping
support for non-64-bit host systems, since we don't really support building
on 32-bit Windows anymore anyway.

There's a little bit of fixup in windows.configure where some LIB paths
have changed in 2017.

MozReview-Commit-ID: 5XLWjidS6W4

--HG--
extra : rebase_source : 90f79b6f4a2d8d925dd20eb0bf6ab96262c227d5

2017-04-26 15:18:48 -04:00

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