Fixed UNIX compilation

lib/cpu_proc.c

@@ -3,6 +3,9 @@
 #include <bus.h>
 #include <stack.h>
 
+
+reg_type decode_reg(u8 reg);
+
 //process CPU instructions...
 
 void cpu_set_flags(cpu_context *ctx, int8_t z, int8_t n, int8_t h, int8_t c){
@@ -543,4 +546,4 @@ IN_PROC processors[] = {
 
 IN_PROC inst_get_processor(in_type type) {
     return processors[type];
-}
+}