message: Alpine compatibility.
diff: #include "async.h"
  #include "zend_builtin_functions.h"
  #include "ext/standard/file.h"
  +#include <sys/file.h>
  #include <sys/statvfs.h>
  typedef struct
  @@ -1105,12 +1106,10 @@ static PHP_METHOD(swoole_coroutine_util, readFile)
  php_context *context = emalloc(sizeof(php_context));
  -#ifdef LOCK_EX
  if (flags & LOCK_EX)
  {
  ev.lock = 1;
  }
  -#endif
  ev.type = SW_AIO_READ_FILE;
  ev.object = context;
  @@ -1180,12 +1179,10 @@ static PHP_METHOD(swoole_coroutine_util, writeFile)
  ev.flags |= O_TRUNC;
  }
  -#ifdef LOCK_EX
  if (flags & LOCK_EX)
  {
  ev.lock = 1;
  }
  -#endif
  if (!SwooleAIO.init)
  {
  