make ktx target includes and libs private#3

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UX3D-becher wants to merge 11 commits intomasterfrom cmake-config-file-fix

+31-21

Commits on Oct 9, 2020

moved Threads::Threads to private dependencies
UX3D-becher
committed

Commits on Nov 30, 2020

set android zstd link to PRIVATE
UX3D-becher
committed

Commits on Dec 9, 2020

whitespace cleanup to trigger travis build
UX3D-becher
committed