TAKE - fixed sim build, some minor clean up.

[Russell Cattelan <cattelan@xxxxxxxx>]

Date:  Fri Aug 25 12:37:15 PDT 2000
Workarea:  gibble.americas.sgi.com:/export/extra/x2.4-xfs

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.0-test1-xfs


Modid:  2.4.0-test1-xfs:slinx:73067a
cmd/xfs/sim/src/sim.random.c - 1.112
        - Moved some #define's from xfs_linux to here. 
          They were only used here.

linux/fs/xfs/xfs_dir.c - 1.128
        - changed irix5_off_t to xfs32_off_t more consistent

linux/fs/xfs/xfs_mount.c - 1.236
        - Fixed sim build

linux/fs/xfs/xfs_dir2.c - 1.22
        - changed irix5_off_t to xfs32_off_t more consistent

linux/fs/xfs/pseudo-inc/mountinfo.h - 1.6
        - changed irix5_off_t to xfs32_off_t more consistent
          moved define from xfs_linux.h

linux/fs/xfs/pseudo-inc/sys/dirent.h - 1.4
        - changed irix5_off_t to xfs32_off_t more consistent

linux/fs/xfs/linux/xfs_linux.h - 1.27
        - Removed un-used define's and typedefs.

linux/fs/xfs/xfs_os_defs.h - 1.12
        - Moved stuff from xfs_linux.h