Temporarily disable failing zlib tests on travis (php#10738)

Author: iluuu1994

ext/zlib/tests/gzcompress_basic1.phpt

@@ -2,6 +2,8 @@
 Test gzcompress() function : basic functionality
 --EXTENSIONS--
 zlib
+--SKIPIF--
+<?php if (getenv('TRAVIS')) die('skip Currently fails on Travis'); ?>
 --FILE--
 <?php
 /*

ext/zlib/tests/gzdeflate_basic1.phpt

@@ -2,6 +2,8 @@
 Test gzdeflate() function : basic functionality
 --EXTENSIONS--
 zlib
+--SKIPIF--
+<?php if (getenv('TRAVIS')) die('skip Currently fails on Travis'); ?>
 --FILE--
 <?php
 /*

ext/zlib/tests/gzencode_basic1.phpt

@@ -2,6 +2,8 @@
 Test gzencode() function : basic functionality
 --EXTENSIONS--
 zlib
+--SKIPIF--
+<?php if (getenv('TRAVIS')) die('skip Currently fails on Travis'); ?>
 --FILE--
 <?php
 /*