Add ET_DYN support for the ELF loader, which required adding

relocations, add some more functions to libxunil, use include inside of
tests instead of manually defining types and add basic libc header
files. Move libxunil to the user folder, and add helloworld and
doomgeneric as apps

kernel/src/driver/elf/loader.rs

@@ -36,8 +36,8 @@ pub fn load_file(
     }
 
     return match elf_header.e_type {
-        ET_EXEC => unsafe { load_program(frame_allocator, mapper, elf_header, elf_bytes) },
-        ET_DYN => return null(), // TODO
+        ET_EXEC => unsafe { load_program(frame_allocator, mapper, elf_header, elf_bytes, false) },
+        ET_DYN => unsafe { load_program(frame_allocator, mapper, elf_header, elf_bytes, true) }, // TODO
         ET_REL => return null(),
         _ => return null(),
     };