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Defer to operating system for whichAll (#8921)

The old `whichAll` implementation was not considering different extensions for executables on Windows. By defering to OS-built-in tools we avoid implementing it.

Fixes #8882.
M
Michael Goderbauer committed
14933de986b1264015ea69442603520cff969650
Parent: deb71cc
Committed by GitHub <noreply@github.com> on 3/21/2017, 5:23:44 PM