[main] Make libevent_pthreads non-optional

configure.ac

@@ -148,7 +148,10 @@ OWNTONE_MODULES_CHECK([COMMON], [SQLITE3], [sqlite3 >= 3.5.0],
 		[AC_MSG_RESULT([[runtime will tell]])])
 	])
 
-OWNTONE_MODULES_CHECK([OWNTONE], [LIBEVENT], [libevent >= 2.1.4], [event_base_new], [event2/event.h])
+OWNTONE_MODULES_CHECK([OWNTONE], [LIBEVENT], [libevent >= 2.1.4],
+	[event_base_new], [event2/event.h])
+OWNTONE_MODULES_CHECK([OWNTONE], [LIBEVENT_PTHREADS], [libevent_pthreads],
+	[evthread_use_pthreads], [event2/thread.h])
 
 dnl Check for evhttp_connection_get_peer() signature
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
@@ -263,11 +266,6 @@ OWNTONE_ARG_WITH_CHECK([OWNTONE_OPTS], [libwebsockets support], [libwebsockets],
 	[libwebsockets >= 2.0.2])
 AM_CONDITIONAL([COND_LIBWEBSOCKETS], [[test "x$with_libwebsockets" = "xyes"]])
 
-dnl Build with libevent_pthreads
-OWNTONE_ARG_WITH_CHECK([OWNTONE_OPTS], [libevent_pthreads support],
-	[libevent_pthreads], [LIBEVENT_PTHREADS], [libevent_pthreads],
-	[evthread_use_pthreads], [event2/thread.h])
-
 dnl Build with Avahi (or Bonjour if not)
 OWNTONE_ARG_WITH_CHECK([OWNTONE_OPTS], [Avahi mDNS], [avahi], [AVAHI],
 	[avahi-client >= 0.6.24], [avahi_client_new], [avahi-client/client.h])

src/main.c

@@ -47,9 +47,7 @@
 
 #include <getopt.h>
 #include <event2/event.h>
-#ifdef HAVE_LIBEVENT_PTHREADS
-# include <event2/thread.h>
-#endif
+#include <event2/thread.h>
 #include <libavutil/avutil.h>
 #include <libavutil/log.h>
 #include <libavformat/avformat.h>
@@ -730,9 +728,7 @@ main(int argc, char **argv)
   /* Initialize event base (after forking) */
   CHECK_NULL(L_MAIN, evbase_main = event_base_new());
 
-#ifdef HAVE_LIBEVENT_PTHREADS
   CHECK_ERR(L_MAIN, evthread_use_pthreads());
-#endif
 
   DPRINTF(E_LOG, L_MAIN, "mDNS init\n");
   ret = mdns_init();