bug#57029: macos cannot build emacs after updated gcc and libgccjit to 12.1

[ccqpein]

I just update the gcc and the libgccjit through `brew` tonight and find building the emacs from source has issue. 

after `./autogen.sh`, I ran the `./configure --with-native-compilation` (for simplifying) and got the error message that 

```

checking for gcc_jit_context_acquire in -lgccjit... no

configure: error: ELisp native compiler was requested, but libgccjit was not found.

Please try installing libgccjit or a similar package.

If you are sure you want Emacs be compiled without ELisp native compiler,

pass the --without-native-compilation option to configure.

```

I add `echo $MAC_CFLAGS` and `echo $MAC_LIBS` after line 4269 in `configure.ac` and I figure out it gives me the right including path of libgccjit 12. 

```

-I/usr/local/Cellar/libgccjit/12.1.0/include
-L/usr/local/Cellar/libgccjit/12.1.0/lib/gcc/current /usr/local/Cellar/libgccjit/12.1.0/lib/gcc/12

```

my environment:

macOS 12.5

intel CPU

Thanks.