all: Run go builds in a chroot
all: Run go builds in a chroot

This ensures that all dependencies in the tree are tracked by tup.

Depends on gittup/tup#201 and
https://codereview.appspot.com/141840043/

Closes #199

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>

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