sh: require multilib

Now that libc backend installs the libraries into the directory reported
by gcc as 'multi-os-directory', sh4 libraries are installed into a '!m4'
subdirectory. This directory then confuses GNU ld, which assumes the
exclamation mark to be a word separator and attempts to link to
'/usr/lib' (a directory). However, if multilib is enabled, the default
libraries are installed into the [expected] '/usr/lib/./'. This looks
like an artifact of SuperH's unique way of specifying the multilibs to
be built in GCC (which may list exclusions, starting with '!').

Signed-off-by: Alexey Neyman <stilor@att.net>

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