Upgrade devel/mtbl to version 1.1.0:

• Fix default zlib compression level.
• Add callback data (clos) parameter to mtbl_fileset_partition function and its callback. Early users of mtbl_fileset_partition will need to rewrite accordingly.
• Use 64-bit offsets in blocks with more than 4G of data.
• Fix undefined behavior when seeking past end of mtbl file.

Sponsored by: Farsight Security, Inc.