AC_INIT regression not completely fixed

[Yavor Doganov]

Seen while bootstrapping GNOME with 2.67:

cat > configure.ac <<EOF
AC_INIT([GNOME Foo], [2.31.6],
        [http://bugzilla.gnome.org/enter_bug.cgi?product=gnome-foo],
        [gnome-foo])
AC_OUTPUT
EOF

autoconf
configure.ac:1: warning: AC_INIT: not a literal: 
http://bugzilla.gnome.org/enter_bug.cgi?product=gnome-foo