Revert "leptonica: add PACAKGECONFIG for openjpeg"

This reverts commit 1726e717

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This patch added a build warning.
WARNING: leptonica-1.70-r0 do_configure: QA Issue: leptonica: configure was passed unrecognised options: --without-libopenjpeg [unknown-configure-option]

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>