patch 8.1.0380: "make proto" doesn't work well
Problem: "make proto" doesn't work well.
Solution: Define a few more types for cproto. Update proto files. Fix that
workshop didn't build.
diff --git a/src/proto/digraph.pro b/src/proto/digraph.pro
index dfadc9d..4c12f51 100644
--- a/src/proto/digraph.pro
+++ b/src/proto/digraph.pro
@@ -1,6 +1,6 @@
/* digraph.c */
int do_digraph(int c);
-char_u *get_digraph_for_char(int val);
+char_u *get_digraph_for_char(int val_arg);
int get_digraph(int cmdline);
int getdigraph(int char1, int char2, int meta_char);
void putdigraph(char_u *str);