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WITHOUT_TOOLCHAIN: Fix build of rtld.

Description

WITHOUT_TOOLCHAIN: Fix build of rtld.

MK_TOOLCHAIN==no disables building and installing of pic archives.
c_pic.a is still needed for rtld though so force it to build in lib/libc
and link directly to the objdir version of it for rtld.

Somehow this has been broken since r148725.

Sponsored by: EMC / Isilon Storage Division