pkgconf is an alternative implementation of pkg-config, and it is mostly
compatible with pkg-config, but in the case of HarfBuzz, it adds the
`/usr/local/include` to `INTERFACE_INCLUDE_DIRECTORIES` when reports the
include path, and if the path doesn't exist, the configuration fails.
In the case of HarfBuzz, we do some extra work to make sure that we can
always find the library, so, with a bit of modification, we can skip the
faulty pkgconf intervention and create the correct imported target.
Fixes: QTBUG-117905
Change-Id: Id628e4434633534b0d7bfad9e819a8c05da4944d
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
885d87488a