Add get_distribution_name() and get_version() to OS

supports: LinuxBSD, Windows, macOS, iOS, Android, UWP

Co-authored-by: bruvzg

drivers/unix/os_unix.cpp

@@ -194,6 +194,14 @@ String OS_Unix::get_name() const {
 	return "Unix";
 }
 
+String OS_Unix::get_distribution_name() const {
+	return "";
+}
+
+String OS_Unix::get_version() const {
+	return "";
+}
+
 double OS_Unix::get_unix_time() const {
 	struct timeval tv_now;
 	gettimeofday(&tv_now, nullptr);