rpm.spec.in: Fix "File listed twice" warning/error %{_libdir}/pkgconfig is a directory and should thus be prefixed by %{dir} (oops.) This issue caused the debuginfo build under RHEL 8 (which is apparently now enabled by default-- regardless of whether the RPM actually contains debug info, but that's another matter) to fail with: RPM build errors: File listed twice: /opt/libjpeg-turbo/lib64/pkgconfig/libjpeg.pc File listed twice: /opt/libjpeg-turbo/lib64/pkgconfig/libturbojpeg.pc