eliminate memset() call, since string.h has not neccessarily been included

eliminate memset() call, since string.h has not neccessarily been included

Sun Aug 15 02:47:14 1999  Tim Janik  <timj@gtk.org>

        * glib.h (g_trash_stack_pop): eliminate memset() call, since string.h
        has not neccessarily been included prior to glib.h.

Mon Aug  2 21:03:10 1999  Tim Janik  <timj@gtk.org>

        * configure.in: added --enable-msg-prefix option.

        * gmessages.c (g_log_default_handler): feature "prg_name (pid:%u): "
        if --enable-msg-prefix was selected (use "(process:%u): " if
        g_get_prgname () returns NULL, along the lines of g_on_error_query).