Further reduce number of versioned files storing Emacs version number.

Further reduce number of versioned files storing Emacs version number.

* configure.ac (comma_version, comma_space_version) [mingw32]:
New output variables.
(nt/emacs.rc, nt/emacsclient.rc) [mingw32]: New output files.

* make-dist: Update nt/ for *.rc -> *.rc.in changes.

* nt/emacs.rc.in, nt/emacsclient.rc.in: Rename from nt/emacs.rc, emacsclient.rc.
Let configure generate the real files, and set the version numbers.

* lib-src/Makefile.in (emacsclient.res): Update deps for nt/emacsclient.rc
now being in the build directory, not the source directory.

* nt/Makefile.in (distclean): Delete *.rc.
(emacs.res): Update deps for nt/emacsclient.rc now being in the
build directory, not the source directory.

* admin/admin.el (set-version): No more need to update nt/*.rc.

* admin/authors.el (authors-renamed-files-alist): Add .rc.in files.