Hi,

The "gflags.will_dump_" is defined in the lisp.h and surround by these
directives,

#if defined HAVE_PDUMPER || defined HAVE_UNEXEC

  bool will_dump_ : 1;

#endif

But its references weren't surrounded with the same directives, so
emacs will fail to build without any dumper.

This patch will fix the build errors. Please review and merge this patch. Thanks

Best Regards
Lin