patch 8.2.1425: Vim9: cannot use call() without :call

Problem:    Vim9: cannot use call() without :call.
Solution:   Do not skip over "call(". (closes #6689)

src/testdir/test_vim9_func.vim

@@ -290,6 +290,12 @@ def Test_call_def_varargs()
   CheckScriptFailure(lines, 'E1013:')
 enddef
 
+def Test_call_call()
+  let l = [3, 2, 1]
+  call('reverse', [l])
+  assert_equal([1, 2, 3], l)
+enddef
+
 let s:value = ''
 
 def FuncOneDefArg(opt = 'text')

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1425,
 /**/
     1424,
 /**/

src/vim9compile.c

@@ -6484,8 +6484,15 @@ compile_def_function(ufunc_T *ufunc, int set_return_type, cctx_T *outer_cctx)
 	cmdmod = save_cmdmod;
 
 	// Skip ":call" to get to the function name.
+	p = ea.cmd;
 	if (checkforcmd(&ea.cmd, "call", 3))
+	{
+	    if (*ea.cmd == '(')
+		// not for "call()"
+		ea.cmd = p;
+	    else
 		ea.cmd = skipwhite(ea.cmd);
+	}
 
 	if (!starts_with_colon)
 	{