AsyncPool: Slightly reduce worker memory usage with more conservative start options

this results in a memory footprint reduction of maybe 4MB for a total of 8 workers. Not much, but it's something.

src/pocketmine/utils/Utils.php

@@ -634,4 +634,21 @@ class Utils{
 
 		return array_combine($matches[1], array_map("trim", $matches[2]));
 	}
+
+	/**
+	 * @param int $severity
+	 * @param string $message
+	 * @param string $file
+	 * @param int $line
+	 *
+	 * @return bool
+	 * @throws \ErrorException
+	 */
+	public static function errorExceptionHandler(int $severity, string $message, string $file, int $line) : bool{
+		if(error_reporting() & $severity){
+			throw new \ErrorException($message, 0, $severity, $file, $line);
+		}
+
+		return true; //stfu operator
+	}
 }