cdrom.eclass: We don't know for sure how many discs will be needed

The number of discs may vary between sets and ebuilds may not call
cdrom_load_next_cd() for every argument depending on USE flags and
other conditional factors.

eclass/cdrom.eclass

@@ -103,7 +103,7 @@ cdrom_get_cds() {
 		echo
 	else
 		_cdrom_set_names
-		einfo "This package will need access to ${CDROM_TOTAL_CDS} cds."
+		einfo "This package may need access to ${CDROM_TOTAL_CDS} cds."
 		local cdcnt
 		for cdcnt in $(seq ${#}); do
 			local var=CDROM_NAME_${cdcnt}