MFC r269534:

MFC r269534:

  Integrate lib/libmp into the build/kyua

  - Remove the .t wrapper
  - Fix -Wreturn-type warnings with clang

  This change has been tested on amd64/i386

  Phabric: D530
  Reviewed by: jmmv
  Approved by: jmmv (co--mentor)
  MFC after: 2 weeks
  Sponsored by: EMC / Isilon Storage Division

MFC note: src.opts.mk in the original commit was changed to
          bsd.own.mk.

git-svn-id: svn://svn.freebsd.org/base/stable/10@270285 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f