sysbench: fix URL

Fixes #33131.
Added libomp formula for 64 bit OS X.
simplified script
support for 32bit, see https://github.com/Homebrew/homebrew/pull/33118#discussion_r18749144
- :arch => :intel - corrected indentation
- added test - added fails_with :gcc
- renamed to libiomp5 - changed "#{ENV.cc}" to ENV.cc
renamed
libiomp5: add 20140926 bottle.