arduino: install package_index.json. fixes #3476.

srcpkgs/arduino/template

@@ -1,7 +1,7 @@
 # Template file for 'arduino'
 pkgname=arduino
 version=1.6.5
-revision=1
+revision=2
 makedepends="openjdk"
 hostmakedepends="apache-ant unzip ImageMagick"
 depends="virtual?java-runtime avr-binutils avr-gcc avr-libc avrdude"
@@ -31,7 +31,7 @@ do_build() {
 	cp bin/libastyle-2.05.1j.so \
 		../../../Arduino-$version/build/linux/work/lib/libastylej.so
 	cd  ../../../Arduino-$version/build
-	ant linux-build
+	ant linux-build package-library-index-json-bundle
 	sed -i -e "s#{runtime\.tools\.[^.]*\.path}#/usr#g" \
 		-e "s#\(tools\.avrdude\.config\.path=\).*#\1/etc/avrdude.conf#" \
 		linux/work/hardware/arduino/avr/platform.txt \