mesa: Restore 78-column wrapping of license text in C++-style comments.

mesa: Restore 78-column wrapping of license text in C++-style comments.

The previous commit introduced extra words, breaking the formatting.

This text transformation was done automatically via the following shell
command:
$ git grep 'THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY' | sed 's/:.*$//' | xargs -I {} sh -c 'vim -e -s {} < vimscript2

where 'vimscript2' is a file containing:
/THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY/;/^ *$/ !fmt -w 78 -p '// '
:wq

Reviewed-by: Brian Paul <brianp@vmware.com>