Tweak _test.o to use the putch() syscall.

It's still running in kernel space. Once I make it possible for ELFLoader
to set up a ring 3 task, we'll really be cooking!

Kernel/_test.cpp

@@ -8,5 +8,8 @@ extern "C" int elf_entry()
     char buf[2048];
     int nread = read(fd, buf, sizeof(buf));
     buf[nread] = '\0';
+    for (int i = 0; i < nread; ++i) {
+        putch(buf[i]);
+    }
     return 0;
 }