(cherry picked from commit 55a9fdf0)

Android: renamed default library name for static and dynamic fallback load; fixed libz import for 64-bit platforms

Rationale: 1.2.3 was a security update, and we should avoid using
versions with known security vulnerabilities.

They're not listed in the documentation for the FindZLIB module,
so we shouldn't use them unless necessary.

Now the HAVE_* macros are set in cvconfig.h. Most of them already were there,
but were nonfunctional.

Now the HAVE_* macros are set using cvconfig.h. Previously most
of them already were there, but were always undefined. One,
HAVE_COCOA, I had to add.

This also makes the CMake code more consistent; now, WITH_* variables
are always checked in cmake/*, while HAVE_* variables are checked in
modules/highgui/CMakeLists.txt.

Issue #2820

- added webp (lossy and lossless without alpha channel)
- added tests