trees: use wrapper for dry-running make commands

instead of using lots of if/else conditions, do that once
and set a variable, dry, to :

if not doing a dry run, the variable is empty. prefix this
variable in places where you don't want a certain action to
be performed, on dry runs.

more specifically, : does *nothing* and always returns with
zero status (success).

this results in cleaner code, and a small sloccount reduction.

Signed-off-by: Leah Rowe <leah@libreboot.org>

0 files changed, 0 insertions, 0 deletions