define NULL as (0L) if __cplusplus is defined, to avoid "ANSI C++ forbids

define NULL as (0L) if __cplusplus is defined, to avoid "ANSI C++ forbids

Wed Sep 22 01:53:18 1999  Tim Janik  <timj@gtk.org>

        * glib.h (NULL): define NULL as (0L) if __cplusplus is defined, to
        avoid "ANSI C++ forbids implicit conversion from `void *' in argument
        passing" errors upon NULL usage in C++ programs (gcc-2.95 is on crack
        for erroring out on this, instead of just issueing a warning).

        * glib.h (g_trash_stack_pop): use uncasted NULL again.