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In commit 9fc20a4f (install: Add sane set of defaults for DESTINATION and file type parameters, 2018-11-02, v3.14.0-rc1~410^2~1), a regression was introduced, in which an `install(TARGETS)` with a RUNTIME/LIBRARY/ARCHIVE DESTINATION but no PUBLIC_HEADER/PRIVATE_HEADER DESTINATION would then install the headers. The old behavior did not do this. Restore the old behavior. Fixes: #20326
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