fix Build errors

With these patches, we can now pass build on sparc/mips/s390/powerpc/x86, both 32bits and 64bits.

Peng Tao (4):
      staging/lustre: fix build on s390
      staging/lustre/llite: add missing include file for prefetchw
      staging/lustre/llite: fix build erorr if CONFIG_FS_POSIX_ACL is off
      staging/lustre: fix build when CONFIG_UIDGID_STRICT_TYPE_CHECKS is on