Change not to ignore :FUZE option at USE-SYNTAX

On th named-readtables, specifying macro :FUZE option is able to ignore
any macro charactor conflicts when using NAMED-READTABLES:IN-READTABLE.
On the other hand the cl-syntax, using SYNTAX:USE-SYNTAX cannot ignore
any conflicts in spite of a :FUZE option has been specified.

This patch enables SYNTAX:USE-SYNTAX not to ignore :FUZE option.