Android: Add NDK R19 support

Invinciblerequested to merge
Invincible/cmake:patch-1 into master

Get the highest version of _ANDROID_TOOL_NAME by traversing ${CMAKE_ANDROID_NDK}/toolchains/${_ANDROID_TOOL_NAME_ONLY}.

Issue: #18739 (closed)
Topic-rename: android-toolchain-root

Edited by Brad King

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