Use untar-bz2 for toolchain and builder on UNIX platforms

Author: facchinm

build/build.xml

@@ -787,7 +787,7 @@
     <antcall target="build-arduino-builder" />
 
     <antcall target="avr-toolchain-bundle">
-      <param name="unpack_target" value="untar"/>
+      <param name="unpack_target" value="untar-bz2"/>
       <param name="gcc_archive_file" value="avr-gcc-${AVRGCC-VERSION}-x86_64-pc-linux-gnu.tar.bz2"/>
       <param name="gcc_version" value="${AVRGCC-VERSION}"/>
       <param name="avrdude_archive_file" value="avrdude-${AVRDUDE-VERSION}-x86_64-pc-linux-gnu.tar.bz2"/>
@@ -836,7 +836,7 @@
   <target name="build-arduino-builder" unless="no_arduino_builder">
     <delete dir="${staging_folder}/arduino-builder-${platform}" includeemptydirs="true"/>
     <mkdir dir="${staging_folder}/arduino-builder-${platform}"/>
-    <antcall target="untar">
+    <antcall target="untar-bz2">
       <param name="archive_file" value="./arduino-builder-${platform}-${ARDUINO-BUILDER-VERSION}.tar.bz2" />
       <param name="archive_url" value="https://downloads.arduino.cc/tools/arduino-builder-${platform}-${ARDUINO-BUILDER-VERSION}.tar.bz2" />
       <param name="final_folder" value="${staging_folder}/arduino-builder-${platform}/arduino-builder" />