XXX add tests/tst-hello.so to the bootfs.manifest.skel

could find no way to do it better.

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
elf: aarch64: relocate_rela, relocate_pltgot, resolve_pltgot

this adds basic support for AArch64
object::relocate_rela()
object::relocate_pltgot()
object::resolve_pltgot()

note that in relocate_pltgot() we do not support lazy
relocation for now, and we do not set the object address
and __elf_resolve_pltgot address in elements [1] and [2].

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
elf: implement R_AARCH64_ABS64, and workaround for _Unwind_Resume

implement R_AARCH64_ABS64 relocation and add a workaround
for the _Unwind_Resume symbol.

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>