support/download/go-post-process: drop -o pipefail

This breaks the post_process_unpack() function in
support/download/helpers, which had a sequence of pipe, with "head"
that can abort early and cause the pipe to fail.

Fixes intermitent:

make[1]: *** [package/pkg-generic.mk:190: /builds/tpetazzoni/buildroot/test-output/TestDockerCompose/build/containerd-1.5.8/.stamp_downloaded] Error 141

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/download/go-post-process

@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 
 set -e
-set -o pipefail
 
 . "${0%/*}/helpers"