yyget_text, yyset_lineno, yyset_in, yyset_out, yyget_debug,
yyset_debug, yylex_destroy): Added prototypes (otherwise we'll get
a compilation error if error-on-warning is enabled).
* guile-snarf-docs.in, guile-snarf-docs-texi.in: rewrite &
simplify.
* eval.c: all hash signs are in column 0.
* Makefile.am (guile_filter_doc_snarfage): build using
c-tokenize.c, not filter-doc-snarfage.c.
rearrange snarfing dependencies a bit.
* c-tokenize.lex: new file.