Legacy Platforms with C++11 support

[Computershik73]

Hello, please add support for such configurations as:

• iOS 6 and above (xcode 8.2)
• Windows Phone 8.1 msvc-2013 or at least Windows 10 Mobile (arm) msvc 2015
• Android 2.3 and above (armv7 using latest ndk which supports it)

I am developing a multiplatform app using Qt 5.6 and C++11. I need to scan QR codes with round capstones, but I cannot find any other solution, which does not use OpenCV. OpenCV added support for such QRCodes in version 4.5 btw and is compatible with c++ until version 5.x.

Please do not ignore this request, legacy users will be grateful if you help.

[nihui]

It is difficult to find the corresponding compilation kit and test method for the target configuration you mentioned. opencv-mobile directly uses the original opencv source code for simplification. You may need to find an older version of opencv to use.