libblkid: fix copyright noticed to be consistent (so all are LGPL)

libblkid: fix copyright noticed to be consistent (so all are LGPL)

The libblkid library was intended to be released under the LGPL.
There is very little significant code in version.c; just a version
parser, and the original copyright holder (Theodore Ts'o,
tytso@mit.edu) has confirmed that he had intended to relicense all of
the files under the LGPL during a time when he was the sole author.

Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: John Calcote <john.calcote@gmail.com>
Signed-off-by: Karel Zak <kzak@redhat.com>