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/proto/term.pro b/src/proto/term.pro
index b0ad418..92cb26d 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -73,6 +73,7 @@
 int show_one_termcode(char_u *name, char_u *code, int printit);
 char_u *translate_mapping(char_u *str, int expmap);
 void update_tcap(int attr);
+void swap_tcap(void);
 guicolor_T gui_get_color_cmn(char_u *name);
 guicolor_T gui_get_rgb_color_cmn(int r, int g, int b);
 /* vim: set ft=c : */