cargo-fmt: remove command line validation which did not properly handle the windows environment#3309

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scampi wants to merge 3 commits intorust-lang:masterfrom

scampi:issue2694

Commits on Feb 1, 2019

cargo-fmt: skip only the executable name
scampi
committed

Commits on Feb 2, 2019

canonicalize on Windows returns an extended-length path which adds a leading "\\?\" which needs to be taken into account
scampi
committed

Commits on Feb 5, 2019

cargo-fmt: skip the first two args which are the bin's name and fmt, when called with 'cargo fmt'
scampi
committed