Mk/Uses: replace bare ${ECHO} with ${ECHO_CMD} or ${ECHO_MSG}

ECHO is builtin variable and is cleared when make(1) is invoked
in silent mode, i.e. as ``make -s'', thus making statements that
use it do nothing. Depending on the context, replace it with
either ${ECHO_CMD} or ${ECHO_MSG} (in one case), as appropriate.

PR: 256185
Submitted by: Franco Fichtner