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742b30549f
8f4ba90b8ff47c7f90fe65d3ed37f486f9fe3a74 build: document why we check for std::system (fanquake)
Pull request description:
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.
```
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Sjors:
ACK 8f4ba90b8ff47c7f90fe65d3ed37f486f9fe3a74
Tree-SHA512: 219cac205b36004c607194f6956c2ce6153f192bd4349e505b52c4e511e403e195ce0f462ae10c515e67f1e95d4b1636d526c8e4376004044853b574a84df427