db/simple: eliminate UpdateFileInArchive() if archive API is disabled

src/SongUpdate.cxx

@@ -52,9 +52,13 @@ Song::LoadFile(Storage &storage, const char *path_utf8, Directory &parent)
 	Song *song = NewFile(path_utf8, parent);
 
 	//in archive ?
-	bool success = parent.device == DEVICE_INARCHIVE
+	bool success =
+#ifdef ENABLE_ARCHIVE
+		parent.device == DEVICE_INARCHIVE
 		? song->UpdateFileInArchive(storage)
-		: song->UpdateFile(storage);
+		:
+#endif
+		song->UpdateFile(storage);
 	if (!success) {
 		song->Free();
 		return nullptr;
@@ -113,6 +117,10 @@ Song::UpdateFile(Storage &storage)
 	return true;
 }
 
+#endif
+
+#ifdef ENABLE_ARCHIVE
+
 bool
 Song::UpdateFileInArchive(const Storage &storage)
 {

src/db/plugins/simple/Song.hxx

@@ -20,6 +20,7 @@
 #ifndef MPD_SONG_HXX
 #define MPD_SONG_HXX
 
+#include "check.h"
 #include "Chrono.hxx"
 #include "tag/Tag.hxx"
 #include "Compiler.h"
@@ -109,7 +110,10 @@ struct Song {
 	void Free();
 
 	bool UpdateFile(Storage &storage);
+
+#ifdef ENABLE_ARCHIVE
 	bool UpdateFileInArchive(const Storage &storage);
+#endif
 
 	/**
 	 * Returns the URI of the song in UTF-8 encoding, including its