This is a completion for PR #7390 and fixes #6517 and #815.

Current version of search for MLKROOT environment variable is wrong and should be corrected to (DEFINED ENV{MKLROOT})

VTK uses parentheses in defines, so generated code is wrong:
set(nvcc_flags -m64;-D__OPENCV_BUILD=1;-DvtkRenderingContext2D_AUTOINIT=1(vtkRenderingContextOpenGL);...)

CMake: Building Dynamic Framework on iOS (#8009)

* Updated python script with dynamic parameter

Updated python script to build static library by default

Updated python script to include bitcode flag

Added bitcode flag to c flags

Fixed directories and targets with static

Bitcode parameter fixed

Fixed script for static library

Fixed parameters in build function

Updated cmake common toolchain

Added changes to OpenCV Utils

Updates to cmake

Added cache internal

Updates to common toolchain

Fixed path in framework destination and added UIKit dependency

Dynamic plist for framework

Lib version removed hardcoded value

Removed trailing whitespace in toolchain

* Removed trailing whitespace

* Fixed typo in comment

* Renamed bitcode variable to bitcodedisabled

* Fixed target device family

CMake should not fail.

- added compile check with multiple tries for different configurations
- restored find_package(LAPACK)
- avoided modification of OPENCV_LINKER_LIBS

* moved BLAS/LAPACK detection scripts from opencv_contrib/dnn to the main repository.

* trying to fix the bug with undefined symbols sgesdd_ and dgesdd_

* removed extra whitespaces; disabled LAPACK on IOS

"install DIRECTORY does not allow "COMPONENT" after PATTERN or REGEX."

find_package allows to specify optional components. This way, the
command will not fail if any of the components marked as optional was
not found. This is useful in cases where components such as xfeatures2d,
viz etc. are not available either because they were not compiled by the
user or package maintainers decided to not provide the packages at all.

The user can check the availability of the optional component using the
OpenCV_<component>_FOUND variable.

Unfortunately there is no stable support for installation of PDB files in CMake.
This patch is just eliminate problems with modern versions.

(2.4) Backports from master branch (#7854)