libselinux: Drop confusing comment.

When Eamon created label_file.c, he drew code from the setfiles program,
which I originally wrote.  At the time, setfiles had a comment
about being derived in part from the setfiles.pl script written by SCC, so
Eamon put a comment in label_file.c that tried to preserve that lineage.
However, there was no real code lineage there.  The setfiles program
was inspired by the setfiles.pl perl script, but the implementation was
a complete rewrite.  And while label_file.c drew some data structures and
code from the setfiles C program, it had nothing to do with the setfiles.pl
script at all.  Just drop the comment; it serves no purpose.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

libselinux/src/label_file.c

@@ -3,9 +3,6 @@
  *
  * Author : Eamon Walsh <ewalsh@tycho.nsa.gov>
  * Author : Stephen Smalley <sds@tycho.nsa.gov>
- *
- * This library derived in part from setfiles and the setfiles.pl script
- * developed by Secure Computing Corporation.
  */
 
 #include <fcntl.h>