Merge pull request #2656 from murasesyuka/bugfix/mruby-bin-debugger_enforce_the_c99

adhoc fix for pass build

mrbgems/mruby-bin-debugger/tools/mrdb/cmdbreak.c

@@ -58,9 +58,11 @@ print_api_common_error(int32_t error)
 }
 
 #undef STRTOUL
-#define STRTOUL(ul,s) \
+#define STRTOUL(ul,s) { \
+    int i; \
     ul = 0; \
-    for(int i=0; ISDIGIT(s[i]); i++) ul = 10*ul + (s[i] -'0');
+    for(i=0; ISDIGIT(s[i]); i++) ul = 10*ul + (s[i] -'0'); \
+}
 
 static int32_t
 parse_breakpoint_no(char* args)