LogC version 0.3.0

Added
* support for binding logs to allow combination of multiple log
  instances to single one
* signal masking for `_logc` function and thus for all log outputing
  functions

Changed
* Some functions return defaults directly without allocating internal
  log structure

Fixed
* detection of distribution archive for gperf detection when building
  outside of source files tree
* custom syslog format memory leak