Mac OS X 10.7 and newer don't come with Java installed. They do
include some stub binaries, which ask the user if they want to
install Java when run.

OpenCV's cmake script just checks for the existence of an ant
binary and assumes that Java's available if ant is. As a result,
cmake will configure the build to use Java and it will fail once
it tries to compile the Java bindings.

This fixes the issue by checking for the exit status of
`ant -version` - it exits 0 if Java is installed, or 1
otherwise.

exclude IlmImf/b44ExpLogTable.cpp from the build,

it's used originally to generate IlmImf/b44ExpLogTable.h, but not nessecary for the library.(probably only here for documentation

when included with static linking it introduces a problem with multiple definitions of main()

Move OpenCL SURF to nonfree module

Fixed wrong index in prefilterXSobel function

added test for bug #1448 and hopefully fixes the bug #2898

GPU test fixes

repaired std::string handling

1. Added more sync to reduction.
2. Turned off Image2D feature. Probably its support is not detected correctly.
3. Temporary disabled descriptor tests - can't localize a problem of the ocl descriptor.