Additionally, I have attempted to clean up some CMake issues to make the
package's build interface cleaner, in particular, avoiding polluting the
parent directory's include path with our config.h file (if PCRE2 is being
included as a subdirectory).
This re-adds changes from Theodore's commit:
def175f4a9
and partially reverts changes from Carlo's commit:
92d56a1f7c
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Co-authored-by: Theodore Tsirpanis <teo@tsirpanis.gr>
