Re-fix build warnings about subr-x defsubsts
* lisp/term/haiku-win.el (require): * lisp/progmodes/elisp-mode.el (require): * lisp/isearch.el (require): Require subr-x at compile time, since these use defsubsts/macros from there. * lisp/emacs-lisp/subr-x.el (string-empty-p): Move from here... * lisp/simple.el (string-empty-p): ... to here. This is to help with a build problem where files.el is using the defsubst, but requiring subr-x.el at compile time leads to load errors.
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