install the headers or librarys into the system.
someone who really cares could make them shlibs again and have them
installed into eg, /usr/lib/gcc. not convinced it is worth it.
of ABIs to target. for amd64 and sparc64, we use the old i386 and sparc
subdirectories. for mips64, we build both o32 and n64 libraries.
these files are not yet used, but will be shortly.