Louis Dionne d8278b6823
[libc++] Only include <setjmp.h> from the C library if it exists (#81887)
In 2cea1babefbb, we removed the <setjmp.h> header provided by libc++. However, we did not conditionally include the underlying <setjmp.h>
header only if the C library provides one, which we otherwise do consistently (see e.g. 647ddc08f43c).

rdar://122978778
2024-02-16 14:45:00 -07:00
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