Revert "Update to texinfo-7.1."

This reverts commit 9813bb1d13c625d48ecd950bfaafc274383ca049.

ffmpeg fails to build natively with the new makeinfo:

perl ./doc/texidep.pl . doc/ffmpeg-utils.texi doc/ffmpeg-utils.html >doc/ffmpeg-utils.html.d
makeinfo --html -I doc --no-split -D config-not-all --init-file=./doc/t2h.pm --output doc/ffmpeg-utils.html doc/ffmpeg-utils.texi
makeinfo: error parsing ./doc/t2h.pm: Undefined subroutine &Texinfo::Config::set_from_init_file called at ./doc/t2h.pm line 24.

ports/texinfo/texinfo.patch

@@ -1,16 +1,3 @@
-diff -Paur --no-dereference -- texinfo.upstream/Makefile.in texinfo/Makefile.in
---- texinfo.upstream/Makefile.in
-+++ texinfo/Makefile.in
-@@ -2102,6 +2102,9 @@
- distclean: distclean-recursive
- 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
- 	-rm -f Makefile
-+	# PATCH: Empty .deps directories are left behind.
-+	find -type d -name .deps -prune -exec rm -rf '{}' ';'
-+	rm -rf gnulib/lib/sys
- distclean-am: clean-am distclean-generic distclean-hdr distclean-local \
- 	distclean-tags
- 
 diff -Paur --no-dereference -- texinfo.upstream/configure texinfo/configure
 --- texinfo.upstream/configure
 +++ texinfo/configure
@@ -137,34 +124,18 @@ diff -Paur --no-dereference -- texinfo.upstream/configure texinfo/configure
 +export gl_cv_struct_dirent_d_ino=yes # Only if the OS actually supports this, Sortix does.
 +export ac_cv_func_realloc_0_nonnull=yes # TODO: Investigate this, found in flex.
  # Guess values for system-dependent variables and create Makefiles.
- # Generated by GNU Autoconf 2.71 for GNU Texinfo 7.1.
+ # Generated by GNU Autoconf 2.71 for GNU Texinfo 6.8.
  #
-@@ -36438,10 +36558,8 @@
-       for euc_cn_iconv_const in '' 'const'; do
-   if test "$cross_compiling" = yes
- then :
--  { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
--printf "%s\n" "$as_me: error: in \`$ac_pwd':" >&2;}
--as_fn_error $? "cannot run test program while cross compiling
--See \`config.log' for more details" "$LINENO" 5; }
-+  # PATCH: Don't break cross builds on a minor check like this.
-+  texinfo_cv_sys_iconv_converts_euc_cn=yes
- else $as_nop
-   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
- /* end confdefs.h.  */
-diff -Paur --no-dereference -- texinfo.upstream/info/man.c texinfo/info/man.c
---- texinfo.upstream/info/man.c
-+++ texinfo/info/man.c
-@@ -375,9 +375,9 @@
-   pid_t child;
-   int formatter_status = 0;
+diff -Paur --no-dereference -- texinfo.upstream/Makefile.in texinfo/Makefile.in
+--- texinfo.upstream/Makefile.in
++++ texinfo/Makefile.in
+@@ -1795,6 +1795,9 @@
+ distclean: distclean-recursive
+ 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
+ 	-rm -f Makefile
++	# PATCH: Empty .deps directories are left behind.
++	find -type d -name .deps -prune -exec rm -rf '{}' ';'
++	rm -rf gnulib/lib/sys
+ distclean-am: clean-am distclean-generic distclean-hdr distclean-local \
+ 	distclean-tags
  
--  putenv ("MAN_KEEP_FORMATTING=1"); /* Get codes for bold etc. */
--  putenv ("GROFF_SGR=1"); /* for Debian whose man outputs
--                             'overstrike' sequences without this */
-+  setenv ("MAN_KEEP_FORMATTING", "1", 1); /* Get codes for bold etc. */
-+  setenv ("GROFF_SGR", "1", 1); /* for Debian whose man outputs
-+                                  'overstrike' sequences without this */
- 
-   /* Open a pipe to this program, read the output, and save it away
-      in FORMATTED_PAGE.  The reader end of the pipe is pipes[0]; the

ports/texinfo/texinfo.port

@@ -1,14 +1,12 @@
 NAME=texinfo
 BUILD_LIBRARIES='libiconv? libintl?'
-VERSION=7.1
+VERSION=6.8
 DISTNAME=$NAME-$VERSION
 COMPRESSION=tar.xz
 ARCHIVE=$DISTNAME.$COMPRESSION
-SHA256SUM=deeec9f19f159e046fdf8ad22231981806dac332cc372f1c763504ad82b30953
+SHA256SUM=8eb753ed28bca21f8f56c1a180362aed789229bd62fff58bf8368e9beb59fec4
 UPSTREAM_SITE=https://ftp.gnu.org/gnu/texinfo
 UPSTREAM_ARCHIVE=$ARCHIVE
-LICENSE=GPL-3.0-or-later
 BUILD_SYSTEM=configure
 CONFIGURE_ARGS=--disable-perl-xs
 MAKE_VARS='V=1'
-DEVELOPMENT=true