Recompute all songalbumids at startup

Due to the two Murmur64 implementations for 64 and 32bit machines, the
hash is not compatible when moving the SQLite DB between 32/64 bit hosts.

So we'll recompute all the songalbumids at startup, just in case.

src/db.c

@@ -1118,6 +1118,25 @@ db_files_get_count(void)
   return db_get_count("SELECT COUNT(*) FROM files WHERE disabled = 0;");
 }
 
+void
+db_files_update_songalbumid(void)
+{
+#define Q_SONGALBUMID "UPDATE files SET songalbumid = daap_songalbumid(album_artist, album);"
+  char *errmsg;
+  int ret;
+
+  DPRINTF(E_DBG, L_DB, "Running query '%s'\n", Q_SONGALBUMID);
+
+  errmsg = NULL;
+  ret = sqlite3_exec(hdl, Q_SONGALBUMID, NULL, NULL, &errmsg);
+  if (ret != SQLITE_OK)
+    DPRINTF(E_LOG, L_DB, "Error updating songalbumid: %s\n", errmsg);
+
+  sqlite3_free(errmsg);
+
+#undef Q_SONGALBUMID
+}
+
 void
 db_file_inc_playcount(int id)
 {