patch 8.0.1601: highlight test fails on Win32

Problem:    Highlight test fails on Win32.
Solution:   Check for vtp and vcon support.

src/evalfunc.c

@@ -6198,6 +6198,9 @@ f_has(typval_T *argvars, typval_T *rettv)
 #ifdef FEAT_VREPLACE
 	"vreplace",
 #endif
+#ifdef FEAT_VTP
+	"vtp",
+#endif
 #ifdef FEAT_WILDIGN
 	"wildignore",
 #endif

src/testdir/test_highlight.vim

@@ -519,6 +519,11 @@ func Test_termguicolors()
   if !exists('+termguicolors')
     return
   endif
+  if has('vtp') && !has('vcon')
+    " Win32: 'guicolors' doesn't work without virtual console.
+    call assert_fails('set termguicolors', 'E954:')
+    return
+  endif
 
   " Basic test that setting 'termguicolors' works with one color.
   set termguicolors

src/version.c

@@ -766,6 +766,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1601,
 /**/
     1600,
 /**/