patch 8.2.4565: no command line completion for :breakadd and :breakdel

Problem:    No command line completion for :breakadd and :breakdel.
Solution:   Add completion for :breakadd and :breakdel. (Yegappan Lakshmanan,
            closes #9950)
diff --git a/src/vim.h b/src/vim.h
index 816cfe8..4f80a09 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -801,6 +801,7 @@
 #define EXPAND_ARGLIST		48
 #define EXPAND_DIFF_BUFFERS	49
 #define EXPAND_DISASSEMBLE	50
+#define EXPAND_BREAKPOINT	51
 
 // Values for exmode_active (0 is no exmode)
 #define EXMODE_NORMAL		1