stdenv-bootstrap: force using new libc from stage2

This fix is needed to work around linker-errors such as

    undefined reference to `__libc_csu_fini'

which I got in almost every derivation which is part of stage2. The
reasoning behind this is that the startup-code was simplified[1] and
thus `__libc_csu_fini` doesn't exist anymore.

A workable solution is to use a newer libc which properly links in
stage3. And actually this seems expected given the rationale for stage3:

    # Construct a third stdenv identical to the 2nd, except that this
    # one uses the rebuilt Glibc from stage2.  It still uses the recent
    # binutils and rest of the bootstrap tools, including GCC.

So this patch basically overrides the libraries inside `gcc-unwrapped` -
which is basically the bootstrap tools and thus also contains the libc
used in stage3 - with the shared objects from the freshly built libc
from stage2.

[1] https://sourceware.org/pipermail/libc-alpha/2021-March/123079.html

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