[ld.so] Add dynamic library linking

ld.so will now go through all DT_NEEDED entries in the dynamic table and load and relocate
those shared libraries as well. Lazy linking of functions via the PLT is not yet supported,
all PLT entries are looked up ahead of time by ld.so.

src/user/srv.init/initfs.cpp

@@ -26,7 +26,7 @@ handle_load_request(j6romfs::fs &fs, const char *path, j6_handle_t &vma)
     fs.load_inode_data(in, dest);
     j6_vma_unmap(vma, 0);
 
-    return j6_err_nyi;
+    return j6_status_ok;
 }
 
 void