patch 8.2.4273: the EBCDIC support is outdated

Problem:    The EBCDIC support is outdated.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_exec_while_if.vim b/src/testdir/test_exec_while_if.vim
index 3da2784..3f13b09 100644
--- a/src/testdir/test_exec_while_if.vim
+++ b/src/testdir/test_exec_while_if.vim
@@ -6,11 +6,7 @@
   let i = 0
   while i < 12
     let i = i + 1
-    if has("ebcdic")
-      execute "normal o" . i . "\047"
-    else
-      execute "normal o" . i . "\033"
-    endif
+    execute "normal o" . i . "\033"
     if i % 2
       normal Ax
       if i == 9
@@ -21,21 +17,13 @@
       else
         let j = 9
         while j > 0
-          if has("ebcdic")
-            execute "normal" j . "a" . j . "\x27"
-          else
-            execute "normal" j . "a" . j . "\x1b"
-          endif
+          execute "normal" j . "a" . j . "\x1b"
           let j = j - 1
         endwhile
       endif
     endif
     if i == 9
-      if has("ebcdic")
-        execute "normal Az\047"
-      else
-        execute "normal Az\033"
-      endif
+      execute "normal Az\033"
     endif
   endwhile
   unlet i j