mdev57 5.5 main.file_contents fails on debian5-i386-fulltest.

The line in the file_contents.test removes all the '/lib' substrings from the
path, so file cannot be found if a path contains such a substring.
As i didn't find where it is needed, the line was just removed

per-file comments:
  mysql-test/t/file_contents.test
mdev57 5.5 main.file_contents fails on debian5-i386-fulltest.
        no '/lib' substring cutting.

mysql-test/t/file_contents.test

@@ -35,7 +35,6 @@ if ($dir_bin eq '/usr/') {
 } else {
   # tar.gz package, Windows, or developer work (in BZR)
   $dir_docs = $dir_bin;
-  $dir_docs =~ s|/lib||;
   if(-d "$dir_docs/docs") {
     $dir_docs = "$dir_docs/docs"; # package
   } else {