Fix phpsdk_pgo for multiple CRT support

If dependencies for multiple CRTs are available, phpsdk_pgo didn't know
which one to use, since Config::$currentCrtName is not initialized.
Instead of adding an argument to phpsdk_pgo, we simply get the CRT to
use from the environment.

Author: cmb69

lib/php/libsdk/SDK/Build/PGO/Abstracts/PHP.php

@@ -238,7 +238,7 @@ public function exec(string $php_cmd, string $args = NULL, array $extra_env = ar
 	public function getIdString(): string
 	{
 		return $this->getVersion() . "-"
-			. SDKConfig::getCurrentCrtName() . "-"
+			. getenv('PHP_SDK_VS') . "-"
 			. ($this->isThreadSafe() ? "ts" : "nts") . "-"
 			. ($this->is64bit() ? "x64" : "x86")
 			. "-" . substr(md5(uniqid()), 0, 8);