Outdated libtool creates trouble on macOS

[FX Coudert]

Fifth batch, fixing the following:

warning: back quotes and double quotes must not be escaped in: $as_me:${as_lineno-$LINENO}: WARNING: the \"none\" host is obsolete, use --disable-assembly
warning: back quotes and double quotes must not be escaped in: $as_me: WARNING: the \"none\" host is obsolete, use --disable-assembly
warning: AC_OUTPUT should be used without arguments.

Almost there…

FX

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