Update devel/snappy to 1.1.3.

Snappy v1.1.3, July 6th 2015:

This is the first release to be done from GitHub, which means that
some minor things like the ChangeLog format has changed (git log
format instead of svn log).

  * Add support for Uncompress() from a Source to a Sink.

  * Various minor changes to improve MSVC support; in particular,
    the unit tests now compile and run under MSVC.

Snappy v1.1.2, February 28th 2014:

This is a maintenance release with no changes to the actual
library
source code.

  * Stop distributing benchmark data files that have unclear
    or unsuitable licensing.

  * Add support for padding chunks in the framing format.

(fhajny)