Constant miri::shims::unix::sync::PTHREAD_MUTEX_NORMAL_FLAG

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const PTHREAD_MUTEX_NORMAL_FLAG: i32 = 0x8000000;
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A flag that allows to distinguish PTHREAD_MUTEX_NORMAL from PTHREAD_MUTEX_DEFAULT. Since in glibc they have the same numeric values, but different behaviour, we need a way to distinguish them. We do this by setting this bit flag to the PTHREAD_MUTEX_NORMAL mutexes. See the comment in pthread_mutexattr_settype function.