eclair/build-tfa.sh: MAKE_TARGET: Use '$(PWD)' as a subst for build's pwd

Useful to make a particular file, e.g.
"$(PWD)/build/fvp/release/bl1/event_log.o"

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Iaed9b7255a37e3af6e2521a7774b742d120e7a34
1 file changed