* liece-clfns.el: Require `pym'.

* liece-clfns.el: Require `pym'.
(liece-clfns-subr-fboundp): New macro.
(last,member-if,member-if-not,delete-if,remove-if,remove-if-not,
assoc-if,rassoc-if): Use it.

* liece-inlines.el (string-list-member-ignore-case): Use
`member-ignore-case'.
(string-list-remove-ignore-case): Use remq.
(string-list-member): Abolish.
(string-list-delete-ignore-case): Use delq.
(string-equal-ignore-case): Use `compare-strings' if available.