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.
diff --git a/src/eval.c b/src/eval.c
index 7a23876..08804c0 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -906,7 +906,7 @@
 							     NULL, TRUE) == -1)
 	    {
 		*p = cc;
-		return FAIL;
+		return NULL;
 	    }
 	    *p = cc;
 	}
@@ -5903,7 +5903,7 @@
 	    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)
diff --git a/src/scriptfile.c b/src/scriptfile.c
index 3508139..56186ff 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -2156,7 +2156,7 @@
 
     if (p == NULL)
 	return NULL;
-    prefix = vim_strsave(p);
+    prefix = strlow_save(p);
     if (prefix == NULL)
 	return NULL;
 
diff --git a/src/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
index d43012c..bfc99d5 100644
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -1203,12 +1203,12 @@
        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)
diff --git a/src/version.c b/src/version.c
index 74b03e4..a931516 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4069,
+/**/
     4068,
 /**/
     4067,