maint.mk: detect incorrect GFDL usage
Similar to the existing sc_GPL_version. Fortunately, the two licenses
have enough distinction in wording so that neither regexp is a false
positive for the other license. This won't catch files that line wrap
differently than expected; as it was, the GFDL needed two regexp to
handle the use of GFDL in the m4 project.
* top/maint.mk (_GFDL_regexp, sc_GFDL_version): New rule.
Signed-off-by: Eric Blake <ebb9@byu.net>
(cherry picked from commit
cb361c968d771304ab68ed5cb8016a6b0c1b8cf2)