flex 2.5.31-generated header issues

[Bruce Lilly]

Issue 1. There's a spurious static declaration for function yy_init_globals,
         which leads to compiler warnings:
mflex.h:317: warning: `yy_init_globals' declared `static' but never defined

Issue 2. The generated C file contains two functions, yy_get_column and
         yy_set_column.  There are no declarations for those functions
         (either in the C file itself or in the flex-generated header file).
         Nor does there appear to be any way to exclude those functions.