added include for ffserver dynamically loaded modules

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@809 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffserver.h

+#ifndef FFSERVER_H
+#define FFSERVER_H
+
+/* interface between ffserver and modules */
+
+void ffserver_module_init(void);
+
+#endif