Make "DEST" a make.sh construct instead of ad-hoc

Using "DEST" for our build artifacts inside individual bundlescripts was already well-established convention, but this officializes it by having `make.sh` itself set the variable and create the directory, also handling CYGWIN oddities in a single central place (instead of letting them spread outward from `hack/make/binary` like was definitely on their roadmap, whether they knew it or not; sneaky oddities).

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
Upstream-commit: ac3388367b6493987cef8017774fa4cdb5d2098f
Component: engine

components/engine/hack/make/test-integration-cli

@@ -1,8 +1,6 @@
 #!/bin/bash
 set -e
 
-DEST=$1
-
 bundle_test_integration_cli() {
 	go_test_dir ./integration-cli
 }