Makefile: Ignore SC2329

In previous versions of shellcheck, SC2317 was emitted for every line of
a unused function and we're ignoring the SC2317 completely:
https://github.com/docker/docker-install/blob/6e61729e66af62fd54c0b659751a431be8f90f68/Makefile#L6

We were ignoring this error due to `version_compare` being reported as a
false positive.

After
koalaman/shellcheck@4f81dbe
this was fixed and now it produces one `SC2329` for the whole function
instead of multiple SC2137.

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

Author: vvoland

Makefile

@@ -3,7 +3,7 @@ VERSION?=
 CHANNEL?=
 
 VOLUME_MOUNTS=-v "$(CURDIR)":/v
-SHELLCHECK_EXCLUSIONS=$(addprefix -e, SC1091 SC1117 SC2317)
+SHELLCHECK_EXCLUSIONS=$(addprefix -e, SC1091 SC1117 SC2317 SC2329)
 SHELLCHECK=docker run --rm $(VOLUME_MOUNTS) -w /v koalaman/shellcheck:stable $(SHELLCHECK_EXCLUSIONS)
 
 ENVSUBST_VARS=LOAD_SCRIPT_COMMIT_SHA