Log Message:
Update sphinxsearch to 2.2.5.

Changes:
- added OPTION rand_seed which affects ORDER BY RAND()
- fixed #2042, indextool fails with field mask on 32+ fields
- fixed #2031, wrong encoding with UnixODBC/Oracle source
- fixed #2056, several bugs in RLP tokenizer
- fixed #2054, SHOW THREADS hangs if queries in prefork mode
- fixed #2057, WARNING at indexer on duplicated wordforms
- fixed #2066, snippet generation with weight_order enabled
- fixed exception parsing in queries
- fixed crash in config parser
- fixed MySQL protocol response when daemon maxed out