script: have run-make.sh honor BUILD_DIR like do_cmake.sh does

script: have run-make.sh honor BUILD_DIR like do_cmake.sh does

The BUILD_DIR environment variable is honored by do_cmake.sh in order to
create multiple build output directories. Before this change run-make.sh
did not support BUILD_DIR the same way as do_cmake.sh. This change makes
it possible to use BUILD_DIR with run-make.sh.

Signed-off-by: John Mulligan <jmulligan@redhat.com>
(cherry picked from commit 974effaa95ddbc9816a37e382a96e691f4e3cbdd)
(cherry picked from commit 3425674847f7e8500a5dadf6e2e55c9c1866197a)