kern/test: add wip qemu-virt board support to mesosphere

libraries/libmesosphere/source/kern_debug_log_impl.hpp

@@ -21,6 +21,7 @@ namespace ams::kern {
     class KDebugLogImpl {
         public:
             static NOINLINE bool Initialize();
+            static NOINLINE void PutStringBySemihosting(const char *s);
             static NOINLINE void PutChar(char c);
             static NOINLINE void Flush();