8274562: (fs) UserDefinedFileAttributeView doesn't correctly determine if supported when using OverlayFS

Backport-of: 3d7671b65e8491f3b1fcac8b96401401f783c9f4

Author: GoeLin

src/java.base/unix/native/libnio/fs/UnixNativeDispatcher.c

@@ -317,7 +317,7 @@ Java_sun_nio_fs_UnixNativeDispatcher_init(JNIEnv* env, jclass this)
 
     /* supports extended attributes */
 
-#ifdef _SYS_XATTR_H_
+#if defined(_SYS_XATTR_H) || defined(_SYS_XATTR_H_)
     capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_XATTR;
 #endif
 
@@ -1330,4 +1330,4 @@ Java_sun_nio_fs_UnixNativeDispatcher_flistxattr(JNIEnv* env, jclass clazz,
     if (res == (size_t)-1)
         throwUnixException(env, errno);
     return (jint)res;
-}
+}