Merge branch 'travis-osx' of https://github.com/rudimeier/util-linux

* 'travis-osx' of https://github.com/rudimeier/util-linux:
  travis: add OSX build
  travis: switch to Ubuntu 14.04 Trusty
  build-sys: improve uuidd and script build conditions
  build-sys: use AC_PROG_MKDIR_P and remove a few gnuisms
  build-sys: add missing "not found" strings
  build-sys: fix again UL_SCANF_TYPE_MODIFIER
  tests: don't use system's mount commands
  tests: improve skipping of old btrfs-tools
  tests: remove invalid argument in libmount/debug
  tests: skip old socat silently
  misc: fix icc/clang compiler warnings
  misc: fix printf i386 compiler warnings