Permit the CC environment variable to include arguments (I should have tested the last change a bit more before submitting).
Permit the CC environment variable to include arguments
(I should have tested the last change a bit more before
submitting).

R=rsc
http://go/go-review/1017011
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go