patch 8.0.1531: cannot use 24 bit colors in MS-Windows console

Problem:    Cannot use 24 bit colors in MS-Windows console.
Solution:   Add support for vcon. (Nobuhiro Takasaki, Ken Takasaki,
            fixes #1270, fixes #2060)
diff --git a/src/feature.h b/src/feature.h
index a0b0f7e..d29e599 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -1394,3 +1394,10 @@
 	    || (defined(WIN3264) && defined(FEAT_GUI_W32))
 # define FEAT_FILTERPIPE
 #endif
+
+/*
+ * +vtp: Win32 virtual console.
+ */
+#if !defined(FEAT_GUI) && defined(WIN3264)
+# define FEAT_VTP
+#endif