feat: support optional finding of externals instead of subdirectories #8266
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Fixes #5957
This adds an option to allow usage of external targets that are found via
find_package
andfind_path
instead of adding them viaadd_subdirectory
. The implementation will fallback to the directories if a target/header cannot be found.This is cherry-picked from my PR for allowing filament to be built via vcpkg:
microsoft/vcpkg#41916