adds semihosting to all backends

src/iss/arch/tgc5c.h

@@ -201,6 +201,7 @@ struct tgc5c: public arch_if {
 
     inline uint32_t get_last_branch() { return reg.last_branch; }
 
+
 #pragma pack(push, 1)
     struct TGC5C_regs { 
         uint32_t X0 = 0;