Support bug64159.phpt on Windows CI (phpGH-15895)

This test queries `extOutput` for the first line of output of the
command which was executed when snmpd started (`HexTest` in snmpd.conf).
Since there is no `/bin/sh` on Windows, no command would be run, and as
such we received an empty string.  We fix that by dynamically adjusting
snmpd.conf to run a JScript which has the same output as bigtest.

We also make the test diff more helpful in case of failures, where so
far we only would have known that the output had a different message
digest.

Author: cmb69

.github/scripts/windows/test_task.bat

@@ -103,6 +103,7 @@ popd
 
 rem prepare for snmp
 set MIBDIRS=%DEPS_DIR%\share\mibs
+sed -i "s/exec HexTest .*/exec HexTest cscript\.exe \/nologo %GITHUB_WORKSPACE:\=\/%\/ext\/snmp\/tests\/bigtest\.js/g" %GITHUB_WORKSPACE%\ext\snmp\tests\snmpd.conf
 start %DEPS_DIR%\bin\snmpd.exe -C -c %GITHUB_WORKSPACE%\ext\snmp\tests\snmpd.conf -Ln
 
 set PHP_BUILD_DIR=%PHP_BUILD_OBJ_DIR%\Release

ext/snmp/tests/bigtest.js

@@ -0,0 +1,3 @@
+for (var i = 0; i < 32; i++) {
+    WScript.StdOut.Write("\x03\x02\x04\x09\x12\x0B\x0C\x0D\x0E\x0F\x10\x11\x12\x13\x14\x15\x16\x17");
+}

ext/snmp/tests/bug64159.phpt

@@ -7,7 +7,6 @@ snmp
 --SKIPIF--
 <?php
 require_once(__DIR__.'/skipif.inc');
-if (PHP_OS_FAMILY === "Windows") die("xfail fails on Windows for unknown reasons");
 ?>
 --ENV--
 MIBS=noneXistent
@@ -18,10 +17,15 @@ require_once(__DIR__.'/snmp_include.inc');
 snmp_set_quick_print(false);
 snmp_set_valueretrieval(SNMP_VALUE_LIBRARY);
 
-var_dump(("ab8283f948419b2d24d22f44a80b17d3" === md5(snmpget($hostname, $community, '.1.3.6.1.4.1.2021.8.1.101.1'))));
-
+$ext_output = snmpget($hostname, $community, '.1.3.6.1.4.1.2021.8.1.101.1');
+$md5 = md5($ext_output);
+if ($md5 === "ab8283f948419b2d24d22f44a80b17d3") {
+    echo "okay\n";
+} else {
+    echo $ext_output;
+}
 ?>
 --EXPECTF--
 MIB search path: %s
 Cannot find module (noneXistent): At line %d in (%s)
-bool(true)
+okay