build failure related to (f)lex

[Christoph Egger]

Hi!

Compiling a NetBSD/amd64 release fails with:

cc1: warnings being treated as errors
In file included from external/bsd/am-utils/dist/amd/sun_map_tok.l:62:
external/bsd/am-utils/dist/include/am_defs.h:329: warning: function declaration isn't a prototype
*** [sun_map_tok.o] Error code 1

Christoph