patch 8.2.4273: the EBCDIC support is outdated

Problem:    The EBCDIC support is outdated.
Solution:   Remove the EBCDIC support.
diff --git a/src/testdir/test_edit.vim b/src/testdir/test_edit.vim
index 782e5e0..e3518d8 100644
--- a/src/testdir/test_edit.vim
+++ b/src/testdir/test_edit.vim
@@ -1073,8 +1073,6 @@
 endfunc
 
 func Test_edit_CTRL_V()
-  CheckNotFeature ebcdic
-
   new
   call setline(1, ['abc'])
   call cursor(2, 1)
@@ -1631,11 +1629,7 @@
 func Test_edit_special_chars()
   new
 
-  if has("ebcdic")
-    let t = "o\<C-V>193\<C-V>xc2\<C-V>o303 \<C-V>90a\<C-V>xfg\<C-V>o578\<Esc>"
-  else
-    let t = "o\<C-V>65\<C-V>x42\<C-V>o103 \<C-V>33a\<C-V>xfg\<C-V>o78\<Esc>"
-  endif
+  let t = "o\<C-V>65\<C-V>x42\<C-V>o103 \<C-V>33a\<C-V>xfg\<C-V>o78\<Esc>"
 
   exe "normal " . t
   call assert_equal("ABC !a\<C-O>g\<C-G>8", getline(2))