ant-tasks.eclass: Update upstream download URLs

We haven't provided 1.8 for ages and 1.9.2 has now moved to the
archive location. Even if we bump to 1.9.10 before 1.10, all the
versions are present in the archive location anyway.

eclass/ant-tasks.eclass

@@ -1,4 +1,4 @@
-# Copyright 1999-2015 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License, v2 or later
 
 # @ECLASS: ant-tasks.eclass
@@ -69,15 +69,13 @@ elif [[ ${PV} == *_rc* ]]; then
 else
 	# default for final releases
 	MY_PV=${PV}
-	UPSTREAM_PREFIX="mirror://apache/ant/source"
 	case ${PV} in
 	1.9.*)
+		UPSTREAM_PREFIX="https://archive.apache.org/dist/ant/source"
 		GENTOO_PREFIX="https://dev.gentoo.org/~tomwij/files/dist"
 		;;
-	1.8.4)
-		GENTOO_PREFIX="https://dev.gentoo.org/~sera/distfiles"
-		;;
 	*)
+		UPSTREAM_PREFIX="mirror://apache/ant/source"
 		GENTOO_PREFIX="https://dev.gentoo.org/~caster/distfiles"
 		;;
 	esac