* add a short descriptions of class' use case
* remove checks for update-mime-database - it can be considered available:
* at build time by PACKAGE_WRITE_DEPS
* at package upgrade by RDEPENDS chain
pkg -> shared-mime-info-data -> shared-mime-info
* simplify (accelerate?) xml file extension detection
* run update-mime-database once only at image creation to avoid expensive
redundant operations
* allow shared-mime-info to inherit mime.bbclass by avoiding circular
dependencies
Signed-off-by: Andreas Müller <schnitzeltony@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
