It’s the inverse of record-splice-env! It sucks up the environment and
prints it as a netencode dict! Only the utf-8 clean parts at least.
Change-Id: I96c19fc5ea3a67a23e238f15f4d0fa783081859c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2527
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>