tools/automake: move file requirements to higher strictness

GNU standards requires certain files at the top-level directory
of a package that automake is used with, mostly documentation.

If one of these files happens to be missing, autoreconf would fail.

Move these file requirements to the more strict 'GNITS' setting.

Link: https://www.gnu.org/software/automake/manual/html_node/Strictness.html
Signed-off-by: Michael Pratt <mcpratt@pm.me>

tools/automake/patches/101-do-not-require-files.patch

@@ -0,0 +1,29 @@
+--- a/bin/automake.in
++++ b/bin/automake.in
+@@ -4513,7 +4513,7 @@ sub handle_gettext ()
+ 	    && grep ($_ eq 'intl', @subdirs));
+     }
+ 
+-  require_file ($ac_gettext_location, GNU, 'ABOUT-NLS');
++  require_file ($ac_gettext_location, GNITS, 'ABOUT-NLS');
+ }
+ 
+ # Emit makefile footer.
+@@ -5641,7 +5641,7 @@ sub check_gnu_standards ()
+           # otherwise require non-.md.
+           my $required
+            = (! -f $file && -f "$file.md") ? "$file.md" : $file;
+-          require_file ("$am_file.am", GNU, $required);
++          require_file ("$am_file.am", GNITS, $required);
+         }
+ 
+       # Accept one of these three licenses; default to COPYING.
+@@ -5655,7 +5655,7 @@ sub check_gnu_standards ()
+ 	      last;
+ 	    }
+ 	}
+-      require_file ("$am_file.am", GNU, 'COPYING')
++      require_file ("$am_file.am", GNITS, 'COPYING')
+ 	unless $license;
+     }
+