VS: Revert "Use MSBuild matching toolset host architecture"
Revert commit da402a08 (VS: Use MSBuild matching toolset host architecture, 2019-01-28, v3.14.0-rc1~50^2). Multiple people have reported that the 64-bit `amd64/msbuild` tool fails in cases that the 32-bit `msbuild` works. Drop our change pending further investigation and hopefully a fix to VS. Fixes: #18904, #19037 Issue: #18219
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