unicode: only export internal symbols for the selftests

The exported symbols in utf8-norm.c are not needed for normal
file system consumers, so move them to conditional _GPL exports
just for the selftest.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Gabriel Krisman Bertazi <[e-mail]>

fs/unicode/utf8-norm.c

···
 	}
 	return 0;
 }
-EXPORT_SYMBOL(utf8version_is_supported);
 
 /*
  * UTF-8 valid ranges.
···
 	}
 	return ret;
 }
-EXPORT_SYMBOL(utf8nlen);
 
 /*
  * Set up an utf8cursor for use by utf8byte().
···
 		return -1;
 	return 0;
 }
-EXPORT_SYMBOL(utf8ncursor);
 
 /*
  * Get one byte from the normalized form of the string described by u8c.
···
 		}
 	}
 }
-EXPORT_SYMBOL(utf8byte);
+
+#ifdef CONFIG_UNICODE_NORMALIZATION_SELFTEST_MODULE
+EXPORT_SYMBOL_GPL(utf8version_is_supported);
+EXPORT_SYMBOL_GPL(utf8nlen);
+EXPORT_SYMBOL_GPL(utf8ncursor);
+EXPORT_SYMBOL_GPL(utf8byte);
+#endif