fix for -fno-common
https://gitweb.gentoo.org/repo/gentoo.git/commit/media-sound/scmpc/files?id=c9f42ac8feb314f3f2f6ec7cfd8c535ff33fe735

Index: src/audioscrobbler.h
--- src/audioscrobbler.h.orig
+++ src/audioscrobbler.h
@@ -37,19 +37,19 @@
 /**
  * Last.fm connection data
  */
-struct {
+struct as_conn_t {
 	gchar *session_id;
 	gint64 last_auth;
 	gint64 last_fail;
 	connection_status status;
 	CURL *handle;
 	struct curl_slist *headers;
-} as_conn;
+};
 
 /**
  * cURL data buffer
  */
-gchar *buffer;
+extern gchar *buffer;
 
 /**
  * Initialize cURL