lex: get rid of two warnings
lex: get rid of two warnings

Add a lex option to avoid:
lex.c:1173:17: warning: ‘yyunput’ defined but not used
lex.c:1214:16: warning: ‘input’ defined but not used

Signed-off-by: Jiri Slaby <dfbf39eb5bf303a3db5454d815cb8c8888cbadf9@suse.cz>
Signed-off-by: Jan Safranek <a7f4b96ffdd515ecef00f117294da18555749b0b@redhat.com>

jrfastab/Linux-cgdcbxd,jrfastab/Linux-cgdcbxd,jrfastab/Linux-cgdcbxd,rafalmiel/libcg,jrfastab/Linux-cgdcbxd,rafalmiel/libcg,rafalmiel/libcg,rafalmiel/libcg