Initial version of OpenCL support added.

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@909 d0cd1f9f-072b-0410-8dd7-cf729c803f20
Cleaned up configure.ac and Makefile.am in multiple folder to use OPENCL paths

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@910 d0cd1f9f-072b-0410-8dd7-cf729c803f20