[Bug target/90077] musl has no multlib support

[slyfox at inbox dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90077

Sergei Trofimovich <slyfox at inbox dot ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |slyfox at inbox dot ru

--- Comment #3 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Asked gcc mailing list what interaction we do expect with configure options
--disable-multilib/--with-multilib-list= and out put of 'gcc
-print-multi-os-directory' as:
    https://gcc.gnu.org/pipermail/gcc/2020-March/231981.html