Depend on flex and bison from ports on 9.

According to portsmon, benchmarks/fio's build is currently broken on 9 after
the update to 2.2.11:

  lex: can't open lex.yy.c

with a verbose build it's possible to see that this is because base's flex
on 9 is too old and does not support "-o foo", it requires "-ofoo".

Depending on flex from ports to fix the build is not enough, as then the
yacc call fails:

  /usr/bin/yacc -o y.tab.c -l -d -b y exp/expression-parser.y
  yacc: e - line 68 of "exp/expression-parser.y", syntax error
  %parse-param { long long *result }
  ^
  Makefile:312: recipe for target 'y.tab.c' failed

Fix it by depending on both textproc/flex and devel/bison when the versions
in base are too old.

PR:		205022
Approved by:	bapt (maintainer)

benchmarks/fio/Makefile

@@ -18,6 +18,18 @@ GNUPLOT_DESC=	Support for plotting graphs
 
 GNUPLOT_BUILD_DEPENDS=	${LOCALBASE}/bin/gnuplot:${PORTSDIR}/math/gnuplot
 
+.include <bsd.port.options.mk>
+
+if ${OPSYS} == FreeBSD && ${OSVERSION} < 1000013
+USES+=		bison
+MAKE_ARGS+=	YACC=${LOCALBASE}/bin/bison
+.endif
+
+if ${OPSYS} == FreeBSD && ${OSVERSION} < 1000033
+BUILD_DEPENDS+=	flex>0:${PORTSDIR}/textproc/flex
+MAKE_ARGS+=	LEX=${LOCALBASE}/bin/flex
+.endif
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/fio ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_SCRIPT} ${WRKSRC}/tools/fio_generate_plots ${STAGEDIR}${PREFIX}/bin