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src: don't reset embeder signal handlers

Rodrigo Muino Tomonari requested to merge github/fork/dvyukov/dvyukov-sigaction-fix into main

The only bad handler value we can inhert from before exec is SIG_IGN (any actual function pointer is reset to SIG_DFL during exec). If that's the case, we want to reset it back to SIG_DFL. However, it's also possible that an embeder (or an LD_PRELOAD-ed library) has set up own signal handler for own purposes (e.g. profiling). If that's the case, keep it intact.

Fix #47013 (closed)

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