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Up to [DVB] / dietlibc / libpthread

  add really crappy pthread_rwclock implementation for openssl 1.1

#include <pthread.h>
#include <errno.h>

int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock) {
  do {
    unsigned int cur=rwlock->n;
    if (cur)
      return EBUSY;
  } while (!__sync_bool_compare_and_swap(&rwlock->n,0,0x80000000));
  return 0;
}