patch 8.0.0603: gF test fails on MS-Windows

Problem:    gF test fails on MS-Windows.
Solution:   Use @ instead of : before the line number

Author: brammool

src/testdir/test_gf.vim

@@ -38,7 +38,7 @@ func Test_gF()
   w! Xfile
   close
   new
-  call setline(1, ['one', 'Xfile:3', 'three'])
+  call setline(1, ['one', 'Xfile@3', 'three'])
   2
   call assert_fails('normal gF', 'E37:')
   call assert_equal(2, getcurpos()[1])

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    603,
 /**/
     602,
 /**/