Log Message:
Update security/py-yara to version 3.4.0

The changes include:

 * Short-circuit evaluation for conditions
 * New yr_rules_save_stream/yr_rules_load_stream APIs.
 * load() and save() methods in yara-python accept file-like objects
 * Improvements to the PE and ELF modules
 * Some performance improvements
 * New command-line option --print-module-data
 * Multiple bug fixes.