Removed accidental copy-paste

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
Merge remote-tracking branch 'origin/master'
Fixed clone not defined error

- This defines _GNU_SOURCE so that linux/sched.h would define the clone
  function
- The patch also removes kernel include path from user space builds
  because that would cause confusion for headers.  Specifically, the
  user space glibc headers want to include linux/types.h which should be
  taken from glibc itself and not the kernel.  The user space library
  (liblxrt) doesn't need the include path to the linux kernel anyway.

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>