Merge remote-tracking branch 'stefanha/trivial-patches' into staging

# By liguang (2) and others
# Via Stefan Hajnoczi
* stefanha/trivial-patches:
  qdev: remove redundant abort()
  gitignore: ignore more files
  Use proper term in TCG README
  serial: Fix debug format strings
  Fix typos and misspellings
  Advertise --libdir in configure --help output
  memory: fix a bug of detection of memory region collision
  MinGW: Replace setsockopt by qemu_setsocketopt