patch 9.0.1020: tests call GetSwapFileList() before it is defined

Problem:    Tests call GetSwapFileList() before it is defined.
Solution:   Move the call to after defining the function. (Christopher
            Plewright)

src/testdir/runtest.vim

@@ -161,13 +161,6 @@ if has('mac')
 endif
 
 
-" A previous (failed) test run may have left swap files behind.  Delete them
-" before running tests again, they might interfere.
-for name in s:GetSwapFileList()
-  call delete(name)
-endfor
-
-
 " Prepare for calling test_garbagecollect_now().
 let v:testing = 1
 
@@ -210,6 +203,13 @@ func s:GetSwapFileList()
   return files
 endfunc
 
+" A previous (failed) test run may have left swap files behind.  Delete them
+" before running tests again, they might interfere.
+for name in s:GetSwapFileList()
+  call delete(name)
+endfor
+
+
 " Invoked when a test takes too much time.
 func TestTimeout(id)
   split test.log

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1020,
 /**/
     1019,
 /**/