security/py-{acme,letsencrypt}: Update to 0.4.0

Common:

• Update PORTVERSION and distinfo checksum (0.4.0) [1]
• Update and sort RUN_DEPENDS to match setup.py:install_requires

security/py-acme:

• Update COMMENT to match setup.py:description=
• Add LICENSE_FILE
• Remove spurious USES=gmake dependency

PR: 207306 [1]
Submitted by: Piotr Kubaj <pkubaj anongoth pl> [1]
Approved by: koobs (maintainer, letsencrypt), cpm (maintainer, acme)