[compiler-rt] [sanitizer_common] Block asynchronous signals only (PR #98200)

[Konstantin Bogdanov via llvm-commits]

thevar1able wrote:

With `clang-19` I'm getting `SIGPIPE` in asan build even after [blocking it in our code](https://github.com/ClickHouse/ClickHouse/blob/24.9/src/Daemon/BaseDaemon.cpp#L436), is this expected? Here is a [stacktrace](https://pastila.nl/?00597f1f/37056e1f39a449adc3b96122fb1cf602#Abcg5SnwOe3Q8EKQpe8dXQ==).

https://github.com/llvm/llvm-project/pull/98200