ELFLoader works inside the kernel!

We load /_hello.o which just prints out a simple message.
It executes inside the kernel itself, so no fancy userspace process
or anything, but this is still so cool!

Kernel/_test.cpp

@@ -2,7 +2,7 @@
 
 using namespace Userspace;
 
-int elf_entry()
+extern "C" int elf_entry()
 {
     int fd = open("/Banner.txt");
     char buf[2048];