syntax-check rule 'sc_copyright_check' assumes "Free Software Foundation"

[Assaf Gordon]

Hello,

A minor nit-pick for GnuLib's "make syntax-check",
where "maint.mk" has the following rule:
===
sc_copyright_check:
<...>
        @require='Copyright @copyright\{\} .*'$$(date +%Y)' Free'       \
        in_vc_files=$(texi)                                             \
        halt='out of date copyright in $(texi); update it'              \
          $(_sc_search_regexp)
===

This assumes the copyright year is followed by the word "Free" (implicitly: "Free 
Software Foundation") in the texinfo file.

If one is to use Gnulib on a non FSF project, "make syntax-check" fails on this 
rule.

(This might be intentional, if Gnulib, or just gnulib's syntax-check, is assume 
to be used mainly on FSF projects - if so, not worth changing).

Regards,
 -gordon