Replace ftp with https

Reported by Hans Åberg.

* README, cfg.mk, doc/bison.texi: here.

README

@@ -7,7 +7,7 @@ instructions.
 
 Bison requires GNU m4 1.4.6 or later.  See:
 
-      ftp://ftp.gnu.org/gnu/m4/m4-1.4.6.tar.gz
+      https://ftp.gnu.org/gnu/m4/m4-1.4.6.tar.gz
 
 ** Internationalization
 Bison supports two catalogues: one for Bison itself (i.e., for the

THANKS

@@ -61,7 +61,7 @@ Gilles Espinasse          g.esp@free.fr
 Goran Uddeborg            goeran@uddeborg.se
 Guido Trentalancia        trentalg@aston.ac.uk
 H. Merijn Brand           h.m.brand@hccnet.nl
-Hans Aberg                haberg@matematik.su.se
+Hans Åberg                haberg@matematik.su.se
 Jan Nieuwenhuizen         janneke@gnu.org
 Jerry Quinn               jlquinn@optonline.net
 Jesse Thilo               jthilo@gnu.org

cfg.mk

@@ -34,7 +34,7 @@ _is-dist-target = $(filter-out %clean maintainer-check% maintainer-%-check, \
   $(filter maintainer-% dist% alpha beta major,$(MAKECMDGOALS)))
 
 url_dir_list = \
-  ftp://$(gnu_rel_host)/gnu/bison
+  https://$(gnu_rel_host)/gnu/bison
 
 # Tests not to run as part of "make distcheck".
 local-checks-to-skip =			\

doc/bison.texi

@@ -12540,7 +12540,7 @@ is turned on by default.  If you have problems building in the @file{po}
 subdirectory, it indicates that your system's internationalization
 support is lacking.  You can re-configure Bison with
 @option{--disable-nls} to turn off this support, or you can install GNU
-gettext from @url{ftp://ftp.gnu.org/gnu/gettext/} and re-configure
+gettext from @url{https://ftp.gnu.org/gnu/gettext/} and re-configure
 Bison.  See the file @file{ABOUT-NLS} for more information.
 
 
@@ -12569,7 +12569,7 @@ I found a bug.  What should I include in the bug report?
 @end quotation
 
 Before you send a bug report, make sure you are using the latest
-version.  Check @url{ftp://ftp.gnu.org/pub/gnu/bison/} or one of its
+version.  Check @url{https://ftp.gnu.org/pub/gnu/bison/} or one of its
 mirrors.  Be sure to include the version number in your bug report.  If
 the bug is present in the latest version but not in a previous version,
 try to determine the most recent version which did not contain the bug.