Revert "build.sh: Fix the behavior of specifying CC"

This reverts commit f9394cfcf59ef8d16ebcdef50e0fe4bc45bbf99c.

Reason for revert: some builds are failing, investigating offline (b/138799604)

Change-Id: Id866ef7e0a405d15930989526c22a1d23e89279a
1 file changed