Update android build to latest tools

[mspieth]

Update android build tools to use latest tools and sdk

NDK 20b SDK 28 (29 is latest but not yet prevalent)

[mspieth]

I have pushed the minor updates to mythtv repo which we just wrong before and to support clang properly

[Mark Spieth <mspieth@…>]

In 4948a8b00/mythtv:

Fix some android make files so no webkit works and correct version is used

refs #13563

[Mark Spieth <mspieth@…>]

In 7b6d5263be/mythtv:

Add alternate cross prefix for compilers to support android build

refs #13563

[Mark Spieth <mspieth@…>]

In 780b5f5029/mythtv:

Android: update dependent libraries list

refs #13563

[Mark Spieth <mspieth@…>]

In 51c926b704/mythtv:

Android: remove -lstdc++ from clang android build opts

refs #13563

[Mark Spieth <mspieth@…>]

In bc80a5033f/mythtv:

Android: Fix some dynamic_cast issues

refs #13563

[Mark Spieth <mspieth@…>]

In 00186a1a20/mythtv:

Handle use case where cross_prefix is used in --cc

refs #13563

[Mark Spieth <mspieth@…>]

In c894ef68d/mythtv:

Add some more explicit destructors for shared obj typeinfo critical classes

refs #13563

[Mark Spieth <mspieth@…>]

In 6ae7d90994/mythtv:

Android: remove not required configure debugging

refs #13563