Main: inline mpd_main() on Android

src/Main.cxx

@@ -386,6 +386,9 @@ int main(int argc, char *argv[])
 
 #endif
 
+#ifdef ANDROID
+static inline
+#endif
 int mpd_main(int argc, char *argv[])
 {
 	struct options options;

src/Main.hxx

@@ -25,6 +25,8 @@ struct Instance;
 
 extern Instance *instance;
 
+#ifndef ANDROID
+
 /**
  * A entry point for application.
  * On non-Windows platforms this is called directly from main()
@@ -33,6 +35,8 @@ extern Instance *instance;
  */
 int mpd_main(int argc, char *argv[]);
 
+#endif
+
 #ifdef WIN32
 
 /**