Revert "Makefile, bin: Support multiple GOPATH components"

[ghost]

This reverts commit ff75bc0,
which broke building on windows. See #2833.

cc @karalabe @djdv @jefft0

[Kubuxu]

Random test failure 😃

[djdv]

Works on my machine. 👌

However, I don't know if this revert is necessary. The recommended ways of building on Windows (https://github.com/ipfs/go-ipfs/blob/master/docs/windows.md) are unaffected by ff75bc0, the only broken case is when using make outside of Cygwin or an msys terminal (i.e. using the native Windows command line).

Reverting would obviously break multipath support, so It may be better to keep that in for now and fix native Windows building later on top of that commit rather than reverting.

Thoughts on this?

[jefft0]

It was broken for me inside Cygwin, as I reported #2851 .

[Kubuxu]

Does it only affect native terminal? If yes them I am also against it. cygwin tools make are supposed to be used in cygwin terminal and environment.

[jefft0]

It was broken inside a Cygwin terminal.

[djdv]

Disregard that, thanks @jefft0, I had not seen the breakage in Cygwin. I am in favor of this revert.

[whyrusleeping]

@lgierth do we have consensus here? Is this good to merge?

[ghost]

Yes I think there's consensus