cross: move multilib options to [binaries] section

c_args are meant to be overridden by the user if needed (even via the
environment CFLAGS variables + -Doptimization=plain, for example),
so they should not contain any option that affect the multilib search
path.  For example, a hypothetical native file like this:

   [binaries]
   c = gcc

   [built-in options]
   c_args = ['-m32']

would *not* build 32-bit binaries if -Dc_args is passed to meson.
Such options, instead should be in the [binaries] section.  Adjust
the sample cross files included with meson.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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