[Bro] Bro 2.1 - compiling on RHEL5 64bit

[Matthias Vallentin]

> /usr/local/src/bro-2.1/src/logging/writers/ElasticSearch.cc: In constructor
> 'logging::writer::ElasticSearch::ElasticSearch(logging::WriterFrontend*)':
> /usr/local/src/bro-2.1/src/logging/writers/ElasticSearch.cc:51: warning:
> converting to 'uint64' from 'double'
> /usr/local/src/bro-2.1/src/logging/writers/ElasticSearch.cc: In member
> function 'bool logging::writer::ElasticSearch::HTTPSend(CURL*)':
> /usr/local/src/bro-2.1/src/logging/writers/ElasticSearch.cc:376: error:
> 'CURLOPT_CONNECTTIMEOUT_MS' was not declared in this scope
> /usr/local/src/bro-2.1/src/logging/writers/ElasticSearch.cc:377: error:
> 'CURLOPT_TIMEOUT_MS' was not declared in this scope

This looks like ticket #877. The easiest fix would be to use
git/master instead of 2.1.

    Matthias