now that CPack is no longer supported relative paths are no longer
required. this change also fixes the headers optimizations upon
installation since it requires full paths to work
Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>
I'll find use for it when I implement antialiasing and image
conversions options, maybe something else
Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>