gcc: Fix the passing of LIBRARY_PATH to the linker.

Don't define LINK_LIBGCC_SPEC as empty so that it will be the default
%D, which adds the necessary -L's for the directories in LIBRARY_PATH
to the

gcc: Fix the passing of LIBRARY_PATH to the linker.

Don't define LINK_LIBGCC_SPEC as empty so that it will be the default
%D, which adds the necessary -L's for the directories in LIBRARY_PATH
to the linker command line.

It also adds a duplicate, but I think harmless, -L /usr/lib/gcc80
which we add earlier already. This can be improved separately.

Dragonfly-bug: <https://bugs.dragonflybsd.org/issues/2897>

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