Log Message:
Update to 1.4.15. From the changelog:

documentation:

* Update documentation about how to add a new format to omindex.  Patch from
  Bruno Baruffaldi.

indexers:

* Check for a BOM on HTML files, which for HTML5 should determine the encoding.

omega:

* Allow $if{COND} without any actions which is useful as a way to evaluate
  something but ignore the result if you just want the side effects.  Indeed
  we were already recommending to use it if you want to ignore the return value
  of $log.  Fixes bug introduced in 1.4.14, reported by tuftedocelot.

* Add OmegaScript support for $jsonbool{COND} for encoding a boolean value for
  use in JSON.  This is equivalent to $if{COND,true,false} but more readable.

* Add OmegaScript support for $jsonobject{} which allows producing a JSON
  object from an OmegaScript map.

* Allow specifying a format to $jsonarray{} so it is no longer restricted to
  producing an array of strings.

* Add $keys{MAP} OmegaScript command which gives a sorted list of the keys from
  an OmegaScript map.

portability:

* Simplify probes for snprintf.  The broken snprintf in libbsd in Linux libc4
  is from ~25 years ago so way too ancient to matter now, and all callers
  already handle the pre-ISO semantics of returning -1 for an undersize buffer
  so we don't need to run a test program to probe for this at configure time,
  which is more cross-compile friendly.

* Avoid deprecation warning on recent Linux.  We were including sys/sysctl.h if
  it existed, which it does on Linux but we don't actually use it there.
  Including it now warns that it is deprecated, so skip including it under
  Linux.  Reported on IRC by kumaran.