Fix bug40228*.phpt conflict

Both tests use the same directory structure; we avoid that by
extracting to separate subdirectories.

Closes GH-7831.

Author: cmb69

ext/zip/tests/bug40228-mb.phpt

@@ -4,15 +4,16 @@ Bug #40228 (extractTo does not create recursive empty path)
 <?php if (!extension_loaded("zip")) print "skip"; ?>
 --FILE--
 <?php
-$dest = __DIR__;
-$arc_name = $dest . "/bug40228私はガラスを食べられます.zip";
+$dest = __DIR__ . "/bug40228-mb";
+$arc_name = __DIR__ . "/bug40228私はガラスを食べられます.zip";
 $zip = new ZipArchive;
 $zip->open($arc_name, ZIPARCHIVE::CREATE);
 $zip->extractTo($dest);
 if (is_dir($dest . '/test/empty')) {
     echo "Ok\n";
     rmdir($dest . '/test/empty');
     rmdir($dest . '/test');
+    rmdir($dest);
 } else {
     echo "Failed.\n";
 }

ext/zip/tests/bug40228.phpt

@@ -4,15 +4,16 @@ Bug #40228 (extractTo does not create recursive empty path)
 <?php if (!extension_loaded("zip")) print "skip"; ?>
 --FILE--
 <?php
-$dest = __DIR__;
-$arc_name = $dest . "/bug40228.zip";
+$dest = __DIR__ . "/bug40228";
+$arc_name = __DIR__ . "/bug40228.zip";
 $zip = new ZipArchive;
 $zip->open($arc_name, ZIPARCHIVE::CREATE);
 $zip->extractTo($dest);
 if (is_dir($dest . '/test/empty')) {
     echo "Ok\n";
     rmdir($dest . '/test/empty');
     rmdir($dest . '/test');
+    rmdir($dest);
 } else {
     echo "Failed.\n";
 }