Now it can be ld with `go build` and cross-referenced. Test: treehugger Change-Id: I299efc2d635176519345acf142114097be6bf814
So that it can be built and installed with ```` (cd build/make/tools/canoninja && go install cmd/canoninja.go) ``` Bug: 201713929 Test: internal Change-Id: I38133bf26ccfae5ebf8bc3c68bc595b7274576b9
Bug: 201713929 Test: internal Change-Id: Ifd976eed1e58b7409e3deacf99917206f0149ade