I don't know why it didn't work for the original author, but it definitely
works now.

There is no WIN64 defined in the environment.

OPENCLAMDBLAS and OPENCLAMDFFT never detected under linux.
lib64/import and lib32/import is the path on Windows but not Linux.
for CLAMDBLAS library we should use CLAMDBLAS_PATH (not CLAMDFFT_PATH)

This has no bearing on compilation, but it makes them show up in IDEs.

Also, removing explicit include path configuration,
since QT_USE_FILE takes care of that.

We don't really need it, it makes the code longer, and it can lead to
inconsistent paths when OpenCV is itself inside a symlink.

setting 'char' to be signed by default since some tests fail when it's wrong (e.g. native compilation on ARM Linux)

fixing precommit build on ubuntu-64 (now it takes OCL headers from non-default OCL SDK, but libs from default one)

This also fixes the bug where the Sphinx version gets detected as
"Sphinx vX.Y.Z" instead of "X.Y.Z" on Unix-like systems.

Backport from master.

Old paths can have problems with cross-compilation

Native activity build warning fixed;
Logcat messages for JavaCameraView updated (Bug #2876);
Some fixes for feature #2893 done.

Issue #2868

Issue #2820

command line option '-Wsign-promo' is valid for C++/ObjC++ but not for C [enabled by default]

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.(cherry picked from commit a423afdd)

Fixed flann build with NEON;
Fixed Haming distance with NEON;
Honest cvRound for WinRT added;
cvRound test added;
Video IO with direct show disabled;