Add test for mandatory zlib locks

Windows has mandatory locks, so we can test the exclusive lock reliably.

Author: ndossche

ext/zlib/tests/005.txt.gz

@@ -0,0 +1,52 @@
+--TEST--
+Test mandatory locking on Windows
+--EXTENSIONS--
+zlib
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY !== "Windows") die("skip Only for Windows because it has mandatory locking");
+?>
+--FILE--
+<?php
+
+echo "without wrapper\n";
+$f = __DIR__."/005.txt.gz";
+$h = gzopen($f,'r');
+$h2 = gzopen($f, 'r');
+stream_set_chunk_size($h2,1);
+
+var_dump(flock($h, LOCK_EX));
+var_dump(fread($h2, 1));
+var_dump(fread($h, 1));
+
+gzclose($h);
+gzclose($h2);
+
+echo "\nwith wrapper\n";
+$f = "compress.zlib://".__DIR__."/005.txt.gz";
+$h = fopen($f,'r');
+$h2 = fopen($f, 'r');
+stream_set_chunk_size($h2, 1);
+
+var_dump(flock($h, LOCK_EX));
+var_dump(fread($h2, 1));
+var_dump(fread($h, 1));
+
+gzclose($h);
+gzclose($h2);
+
+?>
+--EXPECTF--
+without wrapper
+bool(true)
+
+Notice: fread(): Read of 1 bytes failed with errno=13 Permission denied in %s on line %d
+bool(false)
+string(1) "W"
+
+with wrapper
+bool(true)
+
+Notice: fread(): Read of 1 bytes failed with errno=13 Permission denied in %s on line %d
+bool(false)
+string(1) "W"