Merge pull request cyrusimap#4 from elliefm/no-download-autotools

xapian: just use the autotools we've already got thanks

third_party/build.sh

@@ -106,7 +106,7 @@ if [ ! $ITEM ] || [ $ITEM == xapian ] ; then
   cd xapian
   git clean -f -x -d
   git checkout -B build  # needed so sub-checkouts can find their references
-  ./bootstrap
+  ./bootstrap --download-tools=never
   ./configure --enable-silent-rules --prefix=$PREFIX
   cd xapian-core
   make $MAKEOPTS