add unicode block php source file + conversion script

Author: cweiske

data/build-unicode_blocks.php

@@ -0,0 +1,7 @@
+<?php
+/**
+ * Generate the serialized unicode_blocks.dat file shipped with the package
+ */
+$unicode_blocks = include __DIR__ . '/unicode_blocks.php';
+file_put_contents(__DIR__ . '/unicode_blocks.dat', serialize($unicode_blocks));
+?>