(instantiate-fontset): Delete

(instantiate-fontset): Delete
duplicated call of x-complement-fontset-spec.  Call new-fontset
with a correct argument.
(x-compose-font-name): Argument name adjusted for the doc-string.
(x-complement-fontset-spec): Don't alter the contents of the
arguments XLFD-FIELDS and FONTLIST.
(x-style-funcs-alist): The format changed.
(x-modify-font-name): New function.
(create-fontset-from-fontset-spec): The arg STYLE-VARIANT-P is
changed to STYLE-VARIANT, the format also changed.  Use
x-modify-font-name instead of calling functions in
x-style-funcs-alist directly.
(instantiate-fontset): Use x-modify-font-name instead of calling
functions in x-style-funcs-alist directly.
(resolve-fontset-name): New function.