[CLEANUP] add a few "const char *" where appropriate

As suggested by Markus Elfring, a few "const char *" have replaced
some "char *" declarations where a function is not expected to
modify a value. It does not change the code but it helps detecting
coding errors.
diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index 205b0ee..0005bf7 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -36,7 +36,7 @@
 void client_retnclose(struct session *s, int len, const char *msg);
 void client_return(struct session *s, int len, const char *msg);
 void srv_close_with_err(struct session *t, int err, int finst,
-			int status, int msglen, char *msg);
+			int status, int msglen, const char *msg);
 
 int produce_content(struct session *s);