Configuration - adopt building script for using built-in Android cross-compiling support in CMake 3.7

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Author: ski
Date: Wed Dec 21 13:41:04 2016 +0300

    Eliminated CMake warning CMP0054 for Android platform build.

Author: ski
Date: Wed Dec 21 13:41:04 2016 +0300

    0028135: Configuration - adopt building script for using built-in Android cross-compiling support in CMake 3.7
    
    Added toolchain file for using built-in Android cross-compiling support in CMake 3.7

CMake warning CMP0054 appears because line 222 from file "occt/adm/cmake/occt_toolkit.cmake":

if (NOT "${CURRENT_CSF}" STREQUAL "")

in case of Android build, variable CSF_ThreadLibs contains "c" string.
Also, variable "c" is defined in CMake.
Because of these two factors warning CMP0054 appears.

I have checked compilation of occt for Android platform using this patch on CMake 3.7.0 and 3.7.1.

Documentation was updated.

Dear ibs,

please review.

+Note that CMake supports Cross Compiling for Android with simple toolchain files since version **3.7.0**.

The references to obsolete solution should be eliminated from documentation.

Remark from abv,

in OCCT 7.1.0 release notes:

On configuration step of CMake, select "Visual Studio 14 2015" as generator
and specify optional toolset, pointing to the file
adm/templates/uwp.toolchain.config.cmake located within OCCT sources.
Alternatively, run CMake with options -DCMAKE_SYSTEM_NAME=WindowsStore -DCMAKE_SYSTEM_VERSION=10.0.

Please extend the OCCT documentation with similar suggestion for UWP and Android which does not require using addition toolsets just defining 2-4 additional CMake variables.

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Author: ski
Date: Wed Dec 21 19:38:50 2016 +0300

    Updated documentation about building of occt for Android platform via CMake.

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Author: ski
Date: Wed Dec 21 19:50:07 2016 +0300

    Updated documentation about building of occt for UWP via CMake.

Done.

I see on the screenshot, that CMake chooses gcc as compiler in NDK (NDK provides two options - gcc and CLang, we prefer gcc for now).

But is there some information concerning which C++ standard library / STL implementation is used (gnustl_static / gnustl_shared / stlport_static / stlport_shared)?

It is possible to add one more variable to android toolchain file (or use it from command line):

CMAKE_ANDROID_STL_TYPE
    Set to specify which C++ standard library to use. If not specified, a default will be selected as described in the variable documentation.
(see https://cmake.org/cmake/help/v3.7/variable/CMAKE_ANDROID_STL_TYPE.html#variable:CMAKE_ANDROID_STL_TYPE)

> The default value is gnustl_static.
Please set this variable to "gnustl_shared" and provide description in our documentation.

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Author: ski
Date: Thu Dec 22 12:51:24 2016 +0300

    Added variable CMAKE_ANDROID_STL_TYPE for Android platform build via CMake.

Done.

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dear bugmastre,
there are no remarks, please integrate

I suppose that weekly Android builds should be now based on this procedure.

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