livepatch/klp-convert: abort on special sections

To properly convert alternatives, paravirt ops, and static keys,
klp-convert needs to implement "klp.arch" sections as supported by
d4c3e6e1b193 (“livepatch/x86: apply alternatives and paravirt patches
after relocations”).

There is some amount of ELF section bookkeeping required for this (ie,
moving data structure entries and relocations to their ".klp.arch"
equivalents) but the hardest part will be determining klp_object
relationships.  This may require some larger changes to livepatch API,
so defer support for now.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>