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Fix Debian lintian errors:
  E: mariadb-plugin-provider-bzip2: extended-description-is-empty
  E: mariadb-plugin-provider-lz4: extended-description-is-empty
  E: mariadb-plugin-provider-lzma: extended-description-is-empty
  E: mariadb-plugin-provider-lzo: extended-description-is-empty
  E: mariadb-plugin-provider-snappy: extended-description-is-empty
by adding Debian Policy Manual section 3.4 (The description
of a package) extended descriptions to mariadb-plugin-provide-*
packages