Add skipif for broken strftime %Z

%Z does not work on musl libc. We have decided not work around
this using manual expansion because people shouldn't be using
strftime anyway. This function is slated for future deprecation.

Author: nikic

ext/date/tests/bug27780.phpt

@@ -35,7 +35,7 @@ foreach ($timezones as $timezone) {
     foreach ($timestrings as $timestring) {
         $time = strtotime($timestring);
 
-        echo $time, strftime(" [%Y-%m-%d %H:%M:%S %Z]", $time), " [$timestring]\n";
+        echo $time, date(" [Y-m-d H:i:s T]", $time), " [$timestring]\n";
     }
 
     echo "\n";

ext/date/tests/bug32555.phpt

@@ -3,6 +3,7 @@ Bug #32555 (strtotime("tomorrow") can return false)
 --SKIPIF--
 <?php
 if (substr(PHP_OS, 0, 3) == 'WIN') die('skip strftime uses system TZ');
+if (!strftime('%Z')) die('skip strftime does not support %Z');
 ?>
 --INI--
 date.timezone=US/Eastern

ext/date/tests/bug33532.phpt

@@ -6,6 +6,7 @@ date.timezone=UTC
 --SKIPIF--
 <?php
 if(PHP_OS == 'Darwin' || defined('PHP_WINDOWS_VERSION_MAJOR')) die("skip strftime uses system TZ on Darwin and Windows");
+if (!strftime('%Z')) die('skip strftime does not support %Z');
 ?>
 --FILE--
 <?php

ext/standard/tests/time/strptime_basic.phpt

@@ -2,10 +2,11 @@
 Test strptime() function : basic functionality
 --SKIPIF--
 <?php
-	if (!function_exists('strptime')) {
-		die("skip - strptime() function not available in this build");
-	}
-        if(PHP_OS == 'Darwin') die("skip - strptime() behaves differently on Darwin");
+if (!function_exists('strptime')) {
+    die("skip - strptime() function not available in this build");
+}
+if (PHP_OS == 'Darwin') die("skip - strptime() behaves differently on Darwin");
+if (!strftime('%Z')) die('skip strftime does not support %Z');
 ?>
 --FILE--
 <?php

ext/standard/tests/time/strptime_parts.phpt

@@ -2,9 +2,10 @@
 Test strptime() function : basic functionality
 --SKIPIF--
 <?php
-	if (!function_exists('strptime')) {
-		die("skip - strptime() function not available in this build");
-	}
+if (!function_exists('strptime')) {
+    die("skip - strptime() function not available in this build");
+}
+if (!strftime('%Z')) die('skip strftime does not support %Z');
 ?>
 --FILE--
 <?php