Update depth map for python-opencv

- https://python.readthedocs.io/en/stable/whatsnew/3.4.html
- The `sysconfig` key `SO` is deprecated, it has been replaced by `EXT_SUFFIX`

* Updated ICV packages and IPP integration

* core(test): minMaxIdx IPP regression test

* core(ipp): workaround minMaxIdx problem

* core(ipp): workaround meanStdDev() CV_32FC3 buffer overrun

* Returned semicolon after CV_INSTRUMENT_REGION_IPP()

- IPHONEOS_DEPLOYMENT_TARGET=8.0 by default (minimal for XCode 10)

  * use boundingRect instead of manual loop

* Document distance functors in dist.h

* Add spec for Distance

* Generate appropriate links for symbols