Ping (c,c++): Handling of main() function for freestanding

[Arsen Arsenović]

Ping on this patch.

https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603574.html

For context, see the rest of this thread.  TL;DR is that `int main' 
should implicitly return 0 on freestanding, without the other burdens of 
main (hosted should remain unchanged, as well as non-int `main's).  This 
applies to both the C and C++ frontends.
-- 
Arsen Arsenović
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