Everywhere: Enable building userspace and test binaries on AARCH64

Surely this will just work once the kernel boots, right?

CMakeLists.txt

@@ -228,20 +228,22 @@ endif()
 
 add_subdirectory(AK)
 add_subdirectory(Kernel)
-if(NOT "${SERENITY_ARCH}" STREQUAL "aarch64")
- if (ENABLE_MOLD_LINKER)
- add_link_options(-fuse-ld=mold)
- endif()
 
+if (ENABLE_MOLD_LINKER)
+ add_link_options(-fuse-ld=mold)
+endif()
+
+if(NOT "${SERENITY_ARCH}" STREQUAL "aarch64")
  if (CMAKE_CXX_COMPILER_ID MATCHES "Clang$" OR ENABLE_MOLD_LINKER)
  add_link_options(LINKER:--pack-dyn-relocs=relr)
  else()
  add_link_options(LINKER:-z,pack-relative-relocs)
  endif()
-
- add_subdirectory(Userland)
- add_subdirectory(Tests)
 endif()
+
+add_subdirectory(Userland)
+add_subdirectory(Tests)
+
 if (ENABLE_COMPILETIME_HEADER_CHECK)
  add_subdirectory(Meta/HeaderCheck)
 endif()