Deterministic build improvements
* configure.ac (BUILD_DETAILS): Rename from DETERMINISTIC_DUMP, and negate its sense. Use it via AC_SUBST, not AC_DEFINE, and have its value be either empty or --no-build-details. All uses changed. Change option to --disable-build-details. * doc/lispref/cmdargs.texi (Initial Options): Document --no-build-details. * doc/lispref/internals.texi (Building Emacs): * etc/NEWS: Document --disable-build-details. * doc/lispref/intro.texi (Version Info): Say that emacs-build-time can be nil. * lisp/erc/erc-compat.el (erc-emacs-build-time): Now nil if details are omitted. * lisp/erc/erc.el (erc-cmd-SV): * lisp/version.el (emacs-build-time): Now nil if no build details. (emacs-version): Output build time only if build details. * src/Makefile.in (BUILD_DETAILS): New macro. (temacs, bootstrap-emacs): Use it. * src/emacs.c (build_details): New var. (standard_args, main): Support --no-build-details. (Vdeterministic_dump): Remove; all uses replaced by !build_details. (syms_of_emacs): Set Vbuild_details to a boolean, not to a Lisp_Object. * src/lisp.h (build_details): New decl. * src/sysdep.c (init_system_name): When !build_details, set system-name to nil, not to "elided".
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