Better support for future plugins
See the thread containing: http://lists.gnu.org/archive/html/emacs-devel/2015-02/msg00720.html * lib-src/make-docfile.c (write_globals): Generate code that #defines Qxxx macros other than Qnil only if DEFINE_NONNIL_Q_SYMBOL_MACROS. Qnil is safe to define even in plugins, since it must be zero for other reasons. * src/lisp.h (DEFINE_LISP_SYMBOL): New macro, replacing and simplifying DEFINE_LISP_SYMBOL_BEGIN / DEFINE_LISP_SYMBOL_END. All uses changed. (DEFINE_NONNIL_Q_SYMBOL_MACROS): New macro, defaulting to true.
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