patch 8.1.1807: more functions can be used as a method
Problem: More functions can be used as a method.
Solution: Add append(), appendbufline(), assert_equal(), etc.
Also add the :eval command.
diff --git a/src/proto/ex_eval.pro b/src/proto/ex_eval.pro
index 34301e2..cb7002a 100644
--- a/src/proto/ex_eval.pro
+++ b/src/proto/ex_eval.pro
@@ -12,6 +12,7 @@
void report_make_pending(int pending, void *value);
void report_resume_pending(int pending, void *value);
void report_discard_pending(int pending, void *value);
+void ex_eval(exarg_T *eap);
void ex_if(exarg_T *eap);
void ex_endif(exarg_T *eap);
void ex_else(exarg_T *eap);