include tests in pecl archive, fix test with redis < 2.6.9, fix build warnings

package.xml

@@ -53,6 +53,13 @@ http://pear.php.net/dtd/package-2.0.xsd">
    <file role='src' name='redis.c'/>
    <file role='src' name='redis_session.c'/>
    <file role='src' name='redis_session.h'/>
+   <dir name="tests">
+    <file name="array-tests.php" role="test" />
+    <file name="memory.php" role="test" />
+    <file name="mkring.sh" role="test" />
+    <file name="test.php" role="test" />
+    <file name="TestRedis.php" role="test" />
+   </dir> <!-- //tests -->
   </dir> <!-- / -->
  </contents>
  <dependencies>

tests/TestRedis.php

@@ -1651,6 +1651,9 @@ public function testPersist() {
     }
 
     public function testClient() {
+        if (version_compare($this->version, "2.6.9", "lt")) {
+            $this->markTestSkipped();
+        }
         /* CLIENT SETNAME */
         $this->assertTrue($this->redis->client('setname', 'phpredis_unit_tests'));