[Bug 1022983] Consider updating Rawhide to Go 1.2 release candidate

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1022983

--- Comment #7 from Adam Miller  ---
For reference, this is the issue I'm seeing building in mock:

--- FAIL: TestCgoTraceback (0.83 seconds)
        crash_cgo_test.go:33: expected "OK\n", but got "#
command-line-arguments\n/tmp/go-build563671405/main.go: In 
function '_cgo_65eb2f8ba551_Cfunc_foo':\n/tmp/go-build563671405/main.go:31:49:
warning: unused variable 'a' [-Wunused
-variable]\nOK\n"
FAIL
FAIL    runtime 15.451s