Remove unused prototypes for `mrb_proc_merge_lvar()`; ref
MODIFY
mrbgems/mruby-eval/src/eval.c
mrbgems/mruby-eval/src/eval.c
@@ -13,7 +13,6 @@ mrb_value mrb_exec_irep(mrb_state *mrb, mrb_value self, struct RProc *p);
mrb_value mrb_obj_instance_eval(mrb_state *mrb, mrb_value self);
mrb_value mrb_mod_module_eval(mrb_state*, mrb_value);
void mrb_codedump_all(mrb_state*, struct RProc*);
-void mrb_proc_merge_lvar(mrb_state *mrb, mrb_irep *irep, struct REnv *env, int num, const mrb_sym *lv, const mrb_value *stack);
static struct RProc*
create_proc_from_string(mrb_state *mrb, const char *s, mrb_int len, mrb_value binding, const char *file, mrb_int line)

MODIFY
mrbgems/mruby-proc-binding/src/proc-binding.c
mrbgems/mruby-proc-binding/src/proc-binding.c
#include <mruby/proc.h>
#include <mruby/variable.h>
-void mrb_proc_merge_lvar(mrb_state *mrb, mrb_irep *irep, struct REnv *env, int num, const mrb_sym *lv, const mrb_value *stack);
-
/* provided by mruby-proc-ext */
mrb_value mrb_proc_source_location(mrb_state *mrb, struct RProc *p);

Remove unused prototypes for `mrb_proc_merge_lvar()`; ref #5511