Support for older GCC versions

[JohnScience]

On some versions, for example 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04), the code produced by LLVM-CBE would fail to get compiled by gcc like this

main.cbe.c:59:10: error: conflicting types for built-in function ‘printf’; expected ‘int(const char *, ...)’ [-Werror=builtin-declaration-mismatch]
   59 | uint32_t printf(uint8_t*, ...);
      |          ^~~~~~
main.cbe.c:3:1: note: ‘printf’ is declared in header ‘<stdio.h>’
    2 | #include <stdint.h>
  +++ |+#include <stdio.h>
    3 | #ifndef __cplusplus
cc1: all warnings being treated as errors

In order to solve the issue, @AP2008 suggested to use -Wno-format that presumably must solve the issue.