Rename *.dat to *.data for common file type

File extension in this case is not part of the test.

Author: petk

ext/standard/tests/strings/bug71806.dat renamed to ext/standard/tests/strings/bug71806.data

@@ -3,7 +3,7 @@ Bug #71806 (php_strip_whitespace() fails on some numerical values)
 --FILE--
 <?php
 
-echo php_strip_whitespace(__DIR__ . '/bug71806.dat');
+echo php_strip_whitespace(__DIR__ . '/bug71806.data');
 
 ?>
 --EXPECT--