This reverts commit a858b64d.
This reverts commit aea275c4.
This reverts commit fc6e6d24.
This reverts commit c4073a27.
This reverts commit cddf1480.
This reverts commit 8c68a701.

The constants are now casted to __SWORD_TYPE, which should resolve the
compiler warnings about signed vs unsigned.

After talking to Kay, we concluded:

This should be fixed in the kernel, not worked around in userspace tools.

Architectures cannot use int and expect magic constants lager than INT_MAX
to work correctly. The kernel header needs to be fixed.

Even coreutils cannot handle it:
  #define RAMFS_MAGIC  0x858458f6
  # stat -f -c%t /
  ffffffff858458f6

  #define BTRFS_SUPER_MAGIC 0x9123683E
  # stat -f -c%t /mnt
  ffffffff9123683e

Although I found the perfect working macro to fix the thing :)

        __extension__ ({                                                \
                        bool _ret = false;                              \
                        switch(f) { case c: _ret=true; };               \
                        ( _ret );                                       \
                })