m4 ChangeLog README bootstrap [branch-1_4]

[Eric Blake]

CVSROOT:        /sources/m4
Module name:    m4
Branch:         branch-1_4
Changes by:     Eric Blake <ericb>      06/09/21 13:07:02

Modified files:
        .              : ChangeLog README bootstrap 

Log message:
        * bootstrap: Add --force option, based on idea from coreutils.
        * README: Document that ./bootstrap and autoreconf are for
        developers, and not lightly done in tarballs.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/m4/ChangeLog?cvsroot=m4&only_with_tag=branch-1_4&r1=1.1.1.1.2.178&r2=1.1.1.1.2.179
http://cvs.savannah.gnu.org/viewcvs/m4/README?cvsroot=m4&only_with_tag=branch-1_4&r1=1.1.1.1.2.3&r2=1.1.1.1.2.4
http://cvs.savannah.gnu.org/viewcvs/m4/bootstrap?cvsroot=m4&only_with_tag=branch-1_4&r1=1.31.2.3&r2=1.31.2.4