patch 8.0.0210: no support for bracketed paste

Problem:    Vim does not support bracketed paste, as implemented by xterm and
            other terminals.
Solution:   Add t_BE, t_BD, t_PS and t_PE.
diff --git a/src/proto/edit.pro b/src/proto/edit.pro
index 7a399c0..f6d645c 100644
--- a/src/proto/edit.pro
+++ b/src/proto/edit.pro
@@ -38,6 +38,7 @@
 void fix_indent(void);
 int in_cinkeys(int keytyped, int when, int line_is_empty);
 int hkmap(int c);
+int bracketed_paste(paste_mode_T mode, int drop, garray_T *gap);
 void ins_scroll(void);
 void ins_horscroll(void);
 int ins_copychar(linenr_T lnum);