Fixed some compiler errors regarding PRId.

mrbgems/mruby-proc-ext/src/proc.c

@@ -54,7 +54,7 @@ mrb_proc_inspect(mrb_state *mrb, mrb_value self)
     if (line != -1) {
       char buf[32];
 
-      snprintf(buf, sizeof(buf), "%"MRB_PRId, line);
+      snprintf(buf, sizeof(buf), "%" PRId32, line);
       mrb_str_cat_cstr(mrb, str, buf);
     }
     else {

src/error.c

@@ -152,7 +152,7 @@ exc_inspect(mrb_state *mrb, mrb_value exc)
     char buf[32];
 
     str = mrb_str_dup(mrb, file);
-    snprintf(buf, sizeof(buf), ":%"MRB_PRId": ", mrb_fixnum(line));
+    snprintf(buf, sizeof(buf), ":%" MRB_PRId ": ", mrb_fixnum(line));
     mrb_str_cat_cstr(mrb, str, buf);
     if (append_mesg) {
       mrb_str_cat_str(mrb, str, mesg);