Like for other windows platforms. This currently doesn't make a difference, but will with next change.

In bug 1259382, some workarounds were added to make the build system alter PATH and not use absolute paths for toolchain programs, because autoconf and the build system doesn't deal with spaces in those very well. But later in bug 1290040, we made find_program return Windows short paths (without spaces), which alleviates the need for those workarounds. We still, however, and unfortunately, need to alter PATH to account for the fact that MSVC DLLs are not necessarily alongside the compiler executables... Depends on D15181

https://hg.mozilla.org/mozilla-central/rev/1d645417b082 https://hg.mozilla.org/mozilla-central/rev/fcf2cca505d4

Backed out for causing bugs: 1516228, 1516090, 1516253. Push with failure: https://treeherder.mozilla.org/#/jobs?repo=mozilla-central&revision=d30b4fd63e1723d205e31251af32ba8930aa9abd Backout: https://hg.mozilla.org/mozilla-central/rev/d2bc993e14ea1384c2d9b80cca098b48eb19948a

Thanks for the backout.

Pushed by mh@glandium.org: https://hg.mozilla.org/integration/autoland/rev/5b112f7e8d9d Add some mk_export_correct_style to win64-aarch64 mozconfig. r=ted https://hg.mozilla.org/integration/autoland/rev/fa8e39feef43 Use absolute paths for compilers, etc. r=ted