Log Message:
security/pear-Crypt_GPG: update to 1.6.4

Update pear-Crypt_GPG to 1.6.4.

1.6.4	(2020-03-22 08:00 UTC)

Changelog:

* Use classmap for autoloading in composer as this package does not follow
  PSR-0.
* Support default gpg binary location on NixOS.
* Fix IgnoreVerifyErrors issues with GnuPG 1.4 and PHP5.
* Add possibility to add custom arguments to gpg commands.
* Add option to choose compression algorithm.
* Compatibility with phpunit >= 6.0.