Fixing the X11 & NULL backends by adding main()

svn-id: r21553

backends/null/null.cpp

@@ -106,6 +106,11 @@ static const OSystem::GraphicsMode s_supportedGraphicsModes[] = {
 	{0, 0, 0}
 };
 
+int main(int argc, char *argv[]) {
+	// Invoke the actual ScummVM main entry point:
+	return scummvm_main(argc, argv);
+}
+
 OSystem_NULL::OSystem_NULL()
 {
 }

backends/sdl/sdl.cpp

@@ -48,7 +48,6 @@ const char* stackCookie = "$STACK: 655360\0";
 
 int main(int argc, char *argv[]) {
 
-
 #if (defined(WIN32) && defined(NO_CONSOLE)) || defined(__SYMBIAN32__)
 	//
 	// Set up redirects for stdout/stderr under Windows and Symbian.

backends/x11/x11.cpp

@@ -58,6 +58,11 @@
 #include <sys/ioctl.h>
 #include <backends/x11/x11.h>
 
+int main(int argc, char *argv[]) {
+	// Invoke the actual ScummVM main entry point:
+	return scummvm_main(argc, argv);
+}
+
 OSystem *OSystem_X11_create() {
 	return OSystem_X11::create(0, 0);
 }