patch 8.2.4069: Vim9: import test fails on MS-Windows

Problem:    Vim9: import test fails on MS-Windows.
Solution:   Ignore case.  Adjust test to avoid name that only differs in case.

src/eval.c

@@ -906,7 +906,7 @@ get_lval(
 							     NULL, TRUE) == -1)
 	    {
 		*p = cc;
-		return FAIL;
+		return NULL;
 	    }
 	    *p = cc;
 	}
@@ -5903,7 +5903,7 @@ handle_subscript(
 	    type_T	*type;
 
 	    // Found script from "import {name} as name", script item name must
-	    // follow.
+	    // follow.  "rettv->vval.v_number" has the script ID.
 	    if (**arg != '.')
 	    {
 		if (verbose)

src/scriptfile.c

@@ -2156,7 +2156,7 @@ get_autoload_prefix(scriptitem_T *si)
 
     if (p == NULL)
 	return NULL;
-    prefix = vim_strsave(p);
+    prefix = strlow_save(p);
     if (prefix == NULL)
 	return NULL;
 

src/testdir/test_vim9_import.vim

@@ -1203,12 +1203,12 @@ def Test_vim9script_autoload_call()
        g:result = 'other'
      enddef
   END
-  writefile(lines, 'Xdir/autoload/other.vim')
+  writefile(lines, 'Xdir/autoload/another.vim')
 
   lines =<< trim END
       vim9script
-      import autoload 'other.vim'
-      call other.Getother()
+      import autoload 'another.vim'
+      call another.Getother()
       assert_equal('other', g:result)
   END
   CheckScriptSuccess(lines)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4069,
 /**/
     4068,
 /**/