vim-patch:8.2.4677: the Athena GUI support is outdated

Problem:    The Athena GUI support is outdated.
Solution:   Remove the Athena GUI code.
0b962e5685

src/nvim/testdir/test_clientserver.vim

@@ -64,8 +64,8 @@ func Test_client_server()
     " the GUI and check that the remote command still works.
     " Need to wait for the GUI to start up, otherwise the send hangs in trying
     " to send to the terminal window.
-    if has('gui_athena') || has('gui_motif')
+    if has('gui_motif')
-      " For those GUIs, ignore the 'failed to create input context' error.
+      " For this GUI ignore the 'failed to create input context' error.
       call remote_send(name, ":call test_ignore_error('E285') | gui -f\<CR>")
     else
       call remote_send(name, ":gui -f\<CR>")

src/nvim/testdir/test_edit.vim

@@ -1967,7 +1967,7 @@ endfunc
 func Test_edit_CTRL_hat()
   CheckFeature xim
 
-  " FIXME: test fails with Athena and Motif GUI.
+  " FIXME: test fails with Motif GUI.
   "        test also fails when running in the GUI.
   CheckFeature gui_gtk
   CheckNotGui

src/nvim/testdir/test_highlight.vim

@@ -722,7 +722,7 @@ func Test_1_highlight_Normalgroup_exists()
   elseif has('gui_gtk2') || has('gui_gnome') || has('gui_gtk3')
     " expect is DEFAULT_FONT of gui_gtk_x11.c
     call assert_match('hi Normal\s*font=Monospace 10', hlNormal)
-  elseif has('gui_motif') || has('gui_athena')
+  elseif has('gui_motif')
     " expect is DEFAULT_FONT of gui_x11.c
     call assert_match('hi Normal\s*font=7x13', hlNormal)
   elseif has('win32')

src/nvim/testdir/test_quotestar.vim

@@ -98,7 +98,7 @@ func Do_test_quotestar_for_x11()
 
     " Running in a terminal and the GUI is available: Tell the server to open
     " the GUI and check that the remote command still works.
-    if has('gui_athena') || has('gui_motif')
+    if has('gui_motif')
       " For those GUIs, ignore the 'failed to create input context' error.
       call remote_send(name, ":call test_ignore_error('E285') | gui -f\<CR>")
     else

src/nvim/testdir/test_startup.vim

@@ -431,7 +431,7 @@ endfunction
 " Test the -reverse and +reverse arguments (for GUI only).
 func Test_reverse()
   CheckCanRunGui
-  CheckAnyOf Feature:gui_gtk Feature:gui_motif Feature:gui_athena
+  CheckAnyOf Feature:gui_gtk Feature:gui_motif
 
   let after =<< trim [CODE]
     call writefile([&background], "Xtest_reverse")
@@ -452,7 +452,7 @@ endfunc
 " Test the -background and -foreground arguments (for GUI only).
 func Test_background_foreground()
   CheckCanRunGui
-  CheckAnyOf Feature:gui_gtk Feature:gui_motif Feature:gui_athena
+  CheckAnyOf Feature:gui_gtk Feature:gui_motif
 
   " Is there a better way to check the effect of -background & -foreground
   " other than merely looking at &background (dark or light)?
@@ -479,7 +479,7 @@ func Test_font()
 
   if has('gui_gtk')
     let font = 'Courier 14'
-  elseif has('gui_motif') || has('gui_athena')
+  elseif has('gui_motif')
     let font = '-misc-fixed-bold-*'
   else
     throw 'Skipped: test does not set a valid font for this GUI'
@@ -501,10 +501,10 @@ endfunc
 " Test the -geometry argument (for GUI only).
 func Test_geometry()
   CheckCanRunGui
-  CheckAnyOf Feature:gui_gtk Feature:gui_motif Feature:gui_athena
+  CheckAnyOf Feature:gui_gtk Feature:gui_motif
 
-  if has('gui_motif') || has('gui_athena')
+  if has('gui_motif')
-    " FIXME: With GUI Athena or Motif, the value of getwinposx(),
+    " FIXME: With GUI Motif the value of getwinposx(),
     "        getwinposy() and getwinpos() do not match exactly the
     "        value given in -geometry. Why?
     "        So only check &columns and &lines for those GUIs.
@@ -533,7 +533,7 @@ endfunc
 " Test the -iconic argument (for GUI only).
 func Test_iconic()
   CheckCanRunGui
-  CheckAnyOf Feature:gui_gtk Feature:gui_motif Feature:gui_athena
+  CheckAnyOf Feature:gui_gtk Feature:gui_motif
 
   call RunVim([], [], '-f -g -iconic -cq')