[Bug-autogen] 5.18.16 compile

[carl hansen]

using gcc 8.2

In file included from gd.c:11:
getdefs.c: In function 'buildDefinition':
getdefs.c:451:29: error: '%s' directive writing up to 255 bytes into a
region of size 253 [-Werror=format-overflow=]
         sprintf(def_str, "  %s'", name_bf);
                             ^~    ~~~~~~~
getdefs.c:451:9: note: 'sprintf' output between 4 and 259 bytes into a
destination of size 255
         sprintf(def_str, "  %s'", name_bf);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors