Merge pull request #290 from rcgordon/autoupdater

Initial shot at writing an ioquake3 autoupdater. Thank you icculus, and everyone who contributed to his patreon! https://www.patreon.com/icculus

code/sys/sys_main.c

@@ -683,6 +683,9 @@ int main( int argc, char **argv )
 	int   i;
 	char  commandLine[ MAX_STRING_CHARS ] = { 0 };
 
+	extern void Sys_LaunchAutoupdater(int argc, char **argv);
+	Sys_LaunchAutoupdater(argc, argv);
+
 #ifndef DEDICATED
 	// SDL version check