Fix duplicate symbols issues.

Index: src/c64dtv/c64dtv-stubs.c
--- src/c64dtv/c64dtv-stubs.c.orig
+++ src/c64dtv/c64dtv-stubs.c
@@ -313,15 +313,3 @@ void rtc58321a_start_clock(rtc_58321a_t *context)
 {
 }
 
-int rsuser_resources_init(void)
-{
-    return -1;
-}
-int rsuser_cmdline_options_init(void)
-{
-    return -1;
-}
-int parallel_cable_cpu_resources_init(void)
-{
-    return -1;
-}
