[Issue 24546] importC musl setjmp.h failure

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24546

--- Comment #1 from johanengelen at weka.io ---
Fails in testsuite here:
https://github.com/dlang/dmd/blob/046679129774bf886e0650fa593c24fb2c7de499/compiler/test/compilable/stdcheaders.c#L30

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