dbus: Move the SIGPOLL FreeBSD compat code into dbus_common.c

No point in storing this in header files anymore since SIGPOLL is only
used in dbus_common.c.

wpa_supplicant/dbus/dbus_common.c

@@ -25,6 +25,17 @@
 #include "dbus_old.h"
 
 
+#ifndef SIGPOLL
+#ifdef SIGIO
+/*
+ * If we do not have SIGPOLL, try to use SIGIO instead. This is needed for
+ * FreeBSD.
+ */
+#define SIGPOLL SIGIO
+#endif
+#endif
+
+
 /**
  * dispatch_initial_dbus_messages - Dispatch initial dbus messages after
  *     claiming bus name

wpa_supplicant/dbus/dbus_new_helpers.h

@@ -115,16 +115,6 @@ struct wpa_dbus_property_desc {
 };
 
 
-#ifndef SIGPOLL
-#ifdef SIGIO
-/*
- * If we do not have SIGPOLL, try to use SIGIO instead. This is needed for
- * FreeBSD.
- */
-#define SIGPOLL SIGIO
-#endif
-#endif
-
 #define WPAS_DBUS_OBJECT_PATH_MAX 150
 #define WPAS_DBUS_INTERFACE_MAX 150
 #define WPAS_DBUS_METHOD_SIGNAL_PROP_MAX 50

wpa_supplicant/dbus/dbus_old.h

@@ -19,16 +19,6 @@ struct wps_credential;
 
 #ifdef CONFIG_CTRL_IFACE_DBUS
 
-#ifndef SIGPOLL
-#ifdef SIGIO
-/*
- * If we do not have SIGPOLL, try to use SIGIO instead. This is needed for
- * FreeBSD.
- */
-#define SIGPOLL SIGIO
-#endif
-#endif
-
 #include <dbus/dbus.h>
 
 #define WPAS_DBUS_OBJECT_PATH_MAX 150