WITH_META_MODE: Only expect a .meta file for the main target.

Since multiple files are generated from one build command, only
the first to run will actually generate a .meta file.  This fix
prevents 'required but missing' rebuilds on each target.

Sponsored by:	EMC / Isilon Storage Division

share/mk/bsd.crunchgen.mk

@@ -106,7 +106,8 @@ CRUNCHGEN?= crunchgen
 CRUNCHENV?= MK_TESTS=no \
 	    _RECURSING_CRUNCH=1
 .ORDER: ${OUTPUTS} objs
-${OUTPUTS}: ${CONF} .META
+${OUTPUTS:[1]}: .META
+${OUTPUTS}: ${CONF}
 	MAKE=${MAKE} ${CRUNCHENV} MAKEOBJDIRPREFIX=${CRUNCHOBJS} \
 	    ${CRUNCHGEN} -fq -m ${OUTMK} -c ${OUTC} ${CONF}