Update libestr to 0.1.5.

Version 0.1.5 2013-03-19
* bugfix: es_strncmp() did not work correctly

Version 0.1.4 2012-09-13
* bugfix: '\\' escape was not recognized when unescaping strings

Version 0.1.3 (rgerhards), 2012-07-04
* bugfix: fixed some problems in build system
* bugfix: license doc COPYING was accidently overwritten, now LGPL again
Update liblognorm to 0.3.7.

Version 0.3.7, 2013-07-17
* added support to load single samples

Version 0.3.6, 2013-03-22
* bugfix: unitialized variable could lead to rulebase load error

Version 0.3.5 (rgerhards), 2012-09-18
* renamed "normalizer" tool to "lognormalizer" to solve name clashes
Import rsyslog-7.4.4 as wip/rsyslog7.

Rsyslog is an enhanced syslogd supporting, among others, MySQL,
PostgreSQL, failover log destinations, syslog/tcp, fine grain
output format control, high precision timestamps, queued operations
and the ability to filter on any message part. It is quite
compatible to stock sysklogd and can be used as a drop-in
replacement.
Add rsyslog7