ignore init functions during bundling

When linking function bundles (.text/.rela/section sym/func sym)
ignore __init functions as they do not honor -ffunction-sections
and violate the one-to-one func/section assumption of the
function bundling.

Signed-off-by: Seth Jennings <sjenning@redhat.com>
Merge pull request #79 from spartacus06/ignore-init-funcs

ignore init functions during bundling