Add/Fix SKIPIF sections of cURL tests

ext/curl/tests/bug45161.phpt

@@ -1,7 +1,21 @@
 --TEST--
 Bug #45161 (Reusing a curl handle leaks memory)
 --SKIPIF--
-<?php $curl_version = curl_version(); if ($curl_version['version_number'] < 0x071100) die("skip: test works only with curl >= 7.17.0"); ?>
+<?php 
+if (substr(PHP_OS, 0, 3) == 'WIN') {
+	exit("skip not for Windows");
+}
+if (!extension_loaded("curl")) {
+	exit("skip curl extension not loaded");
+}
+if (false === getenv('PHP_CURL_HTTP_REMOTE_SERVER'))  {
+	exit("skip PHP_CURL_HTTP_REMOTE_SERVER env variable is not defined");
+}
+$curl_version = curl_version(); 
+if ($curl_version['version_number'] < 0x071100) {
+	exit("skip: test works only with curl >= 7.17.0");
+}
+?>
 --FILE--
 <?php
 

ext/curl/tests/bug46711.phpt

@@ -1,5 +1,14 @@
 --TEST--
 Bug #46711 (lost memory when foreach is used for values passed to curl_setopt())
+--SKIPIF--
+<?php 
+if (!extension_loaded("curl")) {
+	exit("skip curl extension not loaded");
+}
+if (false === getenv('PHP_CURL_HTTP_REMOTE_SERVER'))  {
+	exit("skip PHP_CURL_HTTP_REMOTE_SERVER env variable is not defined");
+}
+?>
 --FILE--
 <?php
 $ch = curl_init();

ext/curl/tests/bug46739.phpt

@@ -1,5 +1,14 @@
 --TEST--
 Bug #46739 (array returned by curl_getinfo should contain content_type key)
+--SKIPIF--
+<?php 
+if (!extension_loaded("curl")) {
+	exit("skip curl extension not loaded");
+}
+if (false === getenv('PHP_CURL_HTTP_REMOTE_SERVER'))  {
+	exit("skip PHP_CURL_HTTP_REMOTE_SERVER env variable is not defined");
+}
+?>
 --FILE--
 <?php
 $ch = curl_init('http://127.0.0.1:9/');

ext/curl/tests/bug48203.phpt

@@ -1,5 +1,14 @@
 --TEST--
 Bug #48203 (Crash when CURLOPT_STDERR is set to regular file)
+--SKIPIF--
+<?php 
+if (!extension_loaded("curl")) {
+	exit("skip curl extension not loaded");
+}
+if (false === getenv('PHP_CURL_HTTP_REMOTE_SERVER'))  {
+	exit("skip PHP_CURL_HTTP_REMOTE_SERVER env variable is not defined");
+}
+?>
 --FILE--
 <?php