Do not use a random FW_CDEV_VERSION as our implemented ABI version

Since linux/firewire-cdev.h header file and libraw1394 sources are
distributed separately, it is wrong to fill in a constant from that
header into the FW_CDEV_IOC_GET_INFO ioctl as the ABI version which
libraw1394 supports.  This may not be forward compatible if an old
libraw1394 is compiled with a new kernel header and ran on top of a
kernel that implements new features that require a compatible
userland.

OK, the damage is already done in released versions of libraw1394.
Hence the FW_CDEV_VERSION of the kernel header file is not going to
be updated anymore in future kernel versions.  (Only the version
internally to firewire-core will be incremented further.)

But let's remove the buggy usage of FW_CDEV_VERSION nevertheless.
Developers of other firewire-cdev client programs might look at
libraw1394 sources.  The libraw1394 sources should not teach them
how to do it wrong.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

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