Fix Windows GZip linking

Fix zlib setup

Make zlib work on Windows

Support for gzip version of ArduPilot manifest

Remove unused FlightGear stuff
More work
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Windows build updates
Linux fixes
Fix unit test run directory

Windows build updates

Android OpenSSL support

Remove Android OpenSSL for now

Move to 64 bit, MSVC 2017

Pairing not supported under Windows
Remove zlib dependency for Windows.

Fixes https://github.com/mavlink/qgroundcontrol/issues/7954

Better build files for android bitness including #define tagging

Disable Pairing code on Android 64 bit builds

Updates for Qt 5.12 and 64 bit

Fix bad push

No current android openssl 64 bit version

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Include prebuilt android OpenSLL libs

This is temporary until we get rid of it

All settings wired and persistent
Cleanup non Airmap builds

Move all airmap related stuff to its own directory

Add switch to QGCExternalLibs.pri to check whether 32bit or 64bit version of SDL should be used on windows