Allow selection of go compiler (#4)
Allow selection of go compiler (#4)

By running `make GO=/path/to/go` we can now select the appropriate go compiler
to use. This also makes it possible to cross compile netns more easily.

Signed-off-by: Paul Barker <ea07171fd37de70b22964565a4c2bfd2bb2b3061@toganlabs.com>
jfrazelle/netns