devel/fsmtrie: Upgrade to version 2.0.0:

• fsmtrie_init() should not assume the size of its error buffer argument.
  
  Added length argument to fsmtrie_init(). This changes to API.
  
  Major interface change so new shared library version number.
• Added code coverage option to configure/make build system.

Sponsored by: Farsight Security, Inc.