import "ovl: don't poison cursor"

* import "ovl: don't poison cursor"
* add patches from the -stable queue:
  - tracing-syscalls-ignore-numbers-outside-nr_syscalls-range
  - kvm-emulator-fix-execution-close-to-the-segment-limit
* import rtl8192du into staging:
  c23ab2d75cdf5a83704cf40258b745bde045591b
  rtl8192du: Fix warnings on kernel 3.18
NOT RELEASED YET

* NOT RELEASED YET
* set ABI to 2.slh.5.