Remove now redundand ifunc relocation code which should have been
removed as part of r341441.

This call to reloc_non_plt() may crash if ifunc resolvers use the
needed libraries symbols since the pass over the needed libs
relocation is not yet done. The change in r341441 ensures the right
relocation order otherwise.

Submitted by: theraven
MFC after: 1 week
Discussed in: https://reviews.freebsd.org/D17529