JDK-6980847 broke 32-bit, since jlong is not directly assignable to ptr:

```
* For target support_native_java.base_libnio_UnixCopyFile.o:
/home/runner/work/jdk/jdk/src/java.base/unix/native/libnio/fs/UnixCopyFile.c: In function 'Java_sun_nio_fs_UnixCopyFile_bufferedCopy0':
/home/runner/work/jdk/jdk/src/java.base/unix/native/libnio/fs/UnixCopyFile.c:83:17: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
   83 | char* buf = (char*)address;
      | ^
cc1: all warnings being treated as errors
```