Merge branch 'upstream-merge'

Merge branch 'upstream-merge'

* upstream-merge: (102 commits)
  issue snd_pcm_start() when capturing audio
  fix 100% CPU load when idle with ALSA
  trace: print a warning if user tries to enable an unknown trace event
  mips: avoid write only variables
  ppc: avoid write only variables
  i386: avoid a write only variable
  vnc: avoid write only variables
  cris: avoid a write only variable
  Delete write only variables
  ppc: remove video.x
  lsi53c895a: avoid a write only variable
  eepro100: initialize a variable in all cases
  cirrus: avoid write only variables
  block: avoid a write only variable
  trace: remove timestamp files when cleaning up
  configure: Send error message from spice check to /dev/null
  win32: Set unbuffered stdout
  .gitignore: Ignore *-timestamp
  acpi: Fix an infinite loop in acpi_table_add
  configure: Remove unneeded defines from checks
  ...

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>