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8f4ba90b8f
It's probably debatable if we support targets like iOS, but for now,
document why we are checking for this standard library feature.
Trying to use `std::system` for a `aarch64-darwin-ios` target results in
```bash
test.cpp:7:10: error: 'system' is unavailable: not available on iOS
7 | std::system("some_command");
| ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdlib.h:203:6: note: 'system' has been explicitly marked unavailable here
203 | int system(const char *) __DARWIN_ALIAS_C(system);
| ^
1 error generated.
```