Add powerpc64-unknown-freebsd target
Per add powerpc64-unknown-freebsd to prevent further breakages.
@@ -81,6 +81,7 @@ mipsel-unknown-linux-gnu \
mipsel-unknown-linux-gnu \
mipsel-unknown-linux-musl \
powerpc-unknown-linux-gnu \
+powerpc64-unknown-freebsd \
powerpc64-unknown-linux-gnu \
powerpc64le-unknown-linux-gnu \
s390x-unknown-linux-gnu \
