Test snmp on Windows CI

We use the snmpd which is now bundled with the net-snmp dependency, and
the MIBS which are also shipped with it.

We also fix the tests/snmpd.conf, and mark two failing tests as XFAIL.

Closes GH-8503.

Author: cmb69

appveyor/test_task.bat

@@ -89,6 +89,10 @@ if not exist "%PHP_BUILD_CACHE_ENCHANT_DICT_DIR%\en_US.aff" (
 mkdir %LOCALAPPDATA%\enchant\hunspell
 copy %PHP_BUILD_CACHE_ENCHANT_DICT_DIR%\* %LOCALAPPDATA%\enchant\hunspell
 
+rem prepare for snmp
+set MIBDIRS=%DEPS_DIR%\share\mibs
+start %DEPS_DIR%\bin\snmpd.exe -C -c %APPVEYOR_BUILD_FOLDER%\ext\snmp\tests\snmpd.conf -Ln
+
 set PHP_BUILD_DIR=%PHP_BUILD_OBJ_DIR%\Release
 if "%THREAD_SAFE%" equ "1" set PHP_BUILD_DIR=%PHP_BUILD_DIR%_TS
 
@@ -101,7 +105,7 @@ rem work-around for some spawned PHP processes requiring OpenSSL
 echo extension=php_openssl.dll >> %PHP_BUILD_DIR%\php.ini
 
 rem remove ext dlls for which tests are not supported
-for %%i in (imap ldap oci8_12c pdo_firebird pdo_oci snmp) do (
+for %%i in (imap ldap oci8_12c pdo_firebird pdo_oci) do (
 	del %PHP_BUILD_DIR%\php_%%i.dll
 )
 
@@ -116,6 +120,8 @@ nmake test TESTS="%OPCACHE_OPTS% -q --offline --show-diff --show-slow 1000 --set
 
 set EXIT_CODE=%errorlevel%
 
+taskkill /f /im snmpd.exe
+
 appveyor PushArtifact %TEST_PHP_JUNIT%
 
 if %EXIT_CODE% GEQ 1 (

ext/snmp/tests/bug64159.phpt

@@ -7,6 +7,7 @@ snmp
 --SKIPIF--
 <?php
 require_once(__DIR__.'/skipif.inc');
+if (PHP_OS_FAMILY === "Windows") die("xfail fails on Windows for unknown reasons");
 ?>
 --ENV--
 MIBS=noneXistent

ext/snmp/tests/snmp_getvalue.phpt

@@ -7,6 +7,7 @@ snmp
 --SKIPIF--
 <?php
 require_once(__DIR__.'/skipif.inc');
+if (PHP_OS_FAMILY === "Windows") die("xfail fails on Windows for unknown reasons");
 ?>
 --FILE--
 <?php

ext/snmp/tests/snmpd.conf

@@ -5,7 +5,7 @@ rocommunity public 127.0.0.1
 rocommunity6 public ::1
 rwcommunity private 127.0.0.1
 
-Do not enable them - being set here they make appropriate OID switch into r/o
+# Do not enable them - being set here they make appropriate OID switch into r/o
 #syslocation  "Somewhere in the world"
 #syscontact  "root"