patch 8.0.0318: small mistake in 7x13 font name

Problem:    Small mistake in 7x13 font name.
Solution:   Use ISO 8859-1 name instead of 10646-1. (Kazunobu Kuriyama)

src/testdir/test_gui.vim

@@ -41,7 +41,7 @@ func Test_getfontname_with_arg()
     call assert_equal('', getfontname('notexist'))
 
     " Valid font name. This is usually the real name of 7x13 by default.
-    let l:fname = '-Misc-Fixed-Medium-R-Normal--13-120-75-75-C-70-ISO10646-1'
+    let l:fname = '-misc-fixed-medium-r-normal--13-120-75-75-c-70-iso8859-1'
     call assert_equal(l:fname, getfontname(l:fname))
 
   elseif has('gui_gtk2') || has('gui_gnome') || has('gui_gtk3')

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    318,
 /**/
     317,
 /**/