3e30e6ab8a

Bash syntax ${ENV:-'0'} and ${ENV='0'} vary only in their behavior when $ENV is set to an empty string (in which case the former expression results in '0' while the latter results in ''.) There is no reason the Makefile should be using the latter expression, and rather confusing when the two different forms are used side-by-side on the same line. Change-Id: I66bb5ea7437c3f2aa9bc4e1afc9b522c450ff976
Description