packages: increase boot timeout
cmake: remove commented out unset()

Redmine: refs #2442, #2582
cmake: remove status message for compiler flag checks

GitHub: fixes #22
Export grn_expr_get_keywords()
power8: fix build failure

See also:

  * http://lists.askmonty.org/pipermail/commits/2014-October/006752.html
  * lp:maria/10.0 4437

Patch by Sergey Vojtovich. Thanks!!!
Optimize -word1 +word2 query as +word2 -word1