Fix intermittent test failures of windows_mb_path tests

Some of these tests create, use and later remove the same folder, so if
these are run in parallel, they may fail due to race conditions[1].  As
quick fix we add appropriate CONFLICTS clauses to prevent parallel
execution of the respective test groups.

[1] <https://ci.appveyor.com/project/php/php-src/builds/31213037/job/48rp13i0frf5t9hl#L5480>

Author: cmb69

ext/standard/tests/file/windows_mb_path/bug71509.phpt

@@ -9,6 +9,8 @@ if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 skip_if_no_required_exts("zip");
 
 ?>
+--CONFLICTS--
+bug71509
 --FILE--
 <?PHP
 // ĺöä

ext/standard/tests/file/windows_mb_path/test_big5_0.phpt

@@ -10,6 +10,8 @@ skip_if_no_required_exts();
 skip_if_wrong_cp(950, "ansi");
 
 ?>
+--CONFLICTS--
+file_big5
 --INI--
 defalut_charset=big5
 --FILE--

ext/standard/tests/file/windows_mb_path/test_big5_1.phpt

@@ -10,6 +10,8 @@ skip_if_no_required_exts();
 skip_if_wrong_cp(950, "ansi");
 
 ?>
+--CONFLICTS--
+dir_big5
 --INI--
 internal_encoding=big5
 --FILE--

ext/standard/tests/file/windows_mb_path/test_big5_2.phpt

@@ -10,6 +10,8 @@ skip_if_no_required_exts();
 skip_if_wrong_cp(950, "ansi");
 
 ?>
+--CONFLICTS--
+file_big5
 --INI--
 defalut_charset=cp950
 --FILE--

ext/standard/tests/file/windows_mb_path/test_big5_to_utf8_0.phpt

@@ -9,6 +9,8 @@ if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 skip_if_no_required_exts();
 
 ?>
+--CONFLICTS--
+file_big5
 --FILE--
 <?php
 /*

ext/standard/tests/file/windows_mb_path/test_big5_to_utf8_1.phpt

@@ -9,6 +9,8 @@ if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 skip_if_no_required_exts();
 
 ?>
+--CONFLICTS--
+dir_big5
 --FILE--
 <?php
 /*

ext/standard/tests/file/windows_mb_path/test_big5_to_utf8_2.phpt

@@ -9,6 +9,8 @@ if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 skip_if_no_required_exts();
 
 ?>
+--CONFLICTS--
+file_big5
 --FILE--
 <?php
 /*

ext/standard/tests/file/windows_mb_path/test_cp1250_to_utf8_0.phpt

@@ -9,6 +9,8 @@ if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 skip_if_no_required_exts();
 
 ?>
+--CONFLICTS--
+file_cp1250
 --FILE--
 <?php
 /*

ext/standard/tests/file/windows_mb_path/test_cp1250_to_utf8_1.phpt

@@ -9,6 +9,8 @@ if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 skip_if_no_required_exts();
 
 ?>
+--CONFLICTS--
+dir_cp1250
 --FILE--
 <?php
 /*

ext/standard/tests/file/windows_mb_path/test_cp1250_to_utf8_2.phpt

@@ -9,6 +9,8 @@ if (getenv("SKIP_SLOW_TESTS")) die("skip slow test");
 skip_if_no_required_exts();
 
 ?>
+--CONFLICTS--
+dir_cp1250
 --FILE--
 <?php
 /*