Merge changes I0e24eb2d,I0fac06f5,Ic27c7d4c,I2a3b423e,Id6b40808, ...

* changes:
  Remove misc obsolete sources.
  android/varint.c: Remove obsolete file.
  block: Remove obsolete files.
  SCSI: Remove obsolete files.
  USB: Remove USB-related sources.
  hw/block/cdrom.c: Remove
  bluetooth: Remove BT-related sources.