patch 8.2.1215: Atari MiNT support is outdated

Problem:    Atari MiNT support is outdated.
Solution:   Nobody responded this code is still useful, so let's delete it.
diff --git a/runtime/doc/os_mint.txt b/runtime/doc/os_mint.txt
index bbc2542..d8b516f 100644
--- a/runtime/doc/os_mint.txt
+++ b/runtime/doc/os_mint.txt
@@ -1,39 +1,15 @@
-*os_mint.txt*   For Vim version 8.2.  Last change: 2005 Mar 29
+*os_mint.txt*   For Vim version 8.2.  Last change: 2020 Jul 14
 
 
 		  VIM REFERENCE MANUAL    by Jens M. Felderhoff
 
 
 							*MiNT* *Atari*
-This file contains the particularities for the Atari MiNT version of Vim.
+The Atari MiNT support was removed with patch 8.2.1215. It probably didn't
+work at that time, since the code was old and not maintained.
 
-For compiling Vim on the Atari running MiNT see "INSTALL" and "Makefile"
-in the src directory.
 
-Vim for MiNT behaves almost exactly like the Unix version.
-The Unix behavior described in the documentation also refers to the
-MiNT version of Vim unless explicitly stated otherwise.
+Originally added by: Jens M. Felderhoff, e-mail: <jmf@infko.uni-koblenz.de>
 
-For wildcard expansion of <~> (home directory) you need a shell that
-expands the tilde.  The vanilla Bourne shell doesn't recognize it.
-With csh and ksh it should work OK.
-
-The MiNT version of vim needs the termcap file /etc/termcap with the
-terminal capabilities of your terminal.  Builtin termcaps are
-supported for the vt52 terminal.  Termcap entries for the TOSWIN window
-manager and the virtual console terminals have been appended to the
-termcap file that comes with the Vim distribution.
-
-If you should encounter problems with swapped <BS> and <Del> keys, see
-|:fixdel|.
-
-Because terminal updating under MiNT is often slow (e.g. serial line
-terminal), the 'showcmd' and 'ruler' options are default off.
-If you have a fast terminal, try setting them on.  You might
-also want to set 'ttyfast'.
-
-Send bug reports to
-
-	Jens M. Felderhoff, e-mail: <jmf@infko.uni-koblenz.de>
 
  vim:tw=78:ts=8:noet:ft=help:norl: