patch 8.2.4680: build failure without +postscript

Problem:    Build failure without +postscript.
Solution:   Use another error message.
diff --git a/src/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
index 5729d73..2c3792f 100644
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -1001,7 +1001,7 @@
       delete('XimportRelDel.vim')
       DoIt()
   END
-  v9.CheckScriptFailure(lines, 'E456:')
+  v9.CheckScriptFailure(lines, 'E484:')
 
   delete('XimportRel.vim')
   delete('XimportRel2.vim')
diff --git a/src/version.c b/src/version.c
index fda6f6a..4e3773b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4680,
+/**/
     4679,
 /**/
     4678,
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 483fe1e..6303cc1 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -2637,7 +2637,7 @@
 			if (do_source(si->sn_name, FALSE, DOSO_NONE, NULL)
 								       == FAIL)
 			{
-			    semsg(_(e_cant_open_file_str_2), si->sn_name);
+			    semsg(_(e_cant_open_file_str), si->sn_name);
 			    goto on_error;
 			}
 		    }