TAKE - remove MIPs ABI info from xfs conditional compilation code

[Steve Lord <lord@xxxxxxx>]

Kill some references to _MIPS_SIM in the xfs code, also add code to
explicitly reject access to files which are too big. The actual
maximum file size still needs fixing.

Date:  Thu Aug  3 12:57:24 PDT 2000
Workarea:  jen.americas.sgi.com:/src/lord/xfs-linux.2.4.0-test5

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:71251a
cmd/xfs/sim/src/libdisk.c - 1.13
        - Include #include <xfs_os_defs.h>

linux/fs/xfs/xfs_bit.c - 1.10
        - Move from _MIPS_SIM to XFS_64

linux/fs/xfs/xfs_bmap_btree.h - 1.49
        - Always use BMBT_USE_64

linux/fs/xfs/xfs_bmap_btree.c - 1.115
        - Fix a couple of compile errors in byte flipping code which we do not
          normally get to.

linux/fs/xfs/xfs_dir_leaf.c - 1.88
        - Move from _MIPS_SIM to XFS_64

linux/fs/xfs/xfs_mount.c - 1.230
        - remove reference to _MIPS_SIM

linux/fs/xfs/xfs_inode.h - 1.139
        - nothing

linux/fs/xfs/xfs_types.h - 1.46
        - Remove dependent on _MIPS_SIM

linux/fs/xfs/pseudo-inc/sys/types.h - 1.18
        - Move from _MIPS_SIM to XFS_64, replace _MIPS_SZLONG with BITS_PER_LONG

linux/fs/xfs/linux/xfs_lrw.c - 1.47
        - Add some code to reject access to files which are bigger than 
XFS_MAX_FILE_OFFSET

linux/fs/xfs/linux/xfs_linux.h - 1.26
        - Move from defining _MIPS_SIM to defining XFS_64 to be 0 or 1 based on
          the size of a long.