prepend previously set $GOPATH values in Makefile (#26)
prepend previously set $GOPATH values in Makefile (#26)

rpm build process sets $GOPATH in the spec file to use or skip bundled
libraries. Makefile should include these to make rpmbuild go
smoothly.

Signed-off-by: Lokesh Mandvekar <46b23e80209bb43857d25fd87bafe9be89c7d33a@fedoraproject.org>
projectatomic/oci-register-machine