DO NOT MERGE: Allow the IDE to select the correct tools

This hack is needed because the AVR core tools are bundled inside the IDE.

This commit must be removed when the new tools are correctly inserted in the
package_index.json.

Author: cmaglie

build/build.xml

@@ -1161,8 +1161,14 @@
     <move file="${staging_folder}/work/${staging_hardware_folder}/tmp/avrdude/avrdude" tofile="${staging_folder}/work/${staging_hardware_folder}/tools/avr"/>
     <antcall target="macosx-fix-bundled-toolchain-missing-symlinks"/>
 
+    <!-- XXX: This is a temporary hack to let the IDE select the correct bundled tools. -->
+    <!-- XXX: THE FOLLOWING LINES MUST BE REMOVED BEFORE MERGING! -->
+    <echo append="true" file="${staging_folder}/work/${staging_hardware_folder}/tools/avr/builtin_tools_versions.txt" message="arduino.avrdude=6.0.1-arduino5${line.separator}"/>
+    <echo append="true" file="${staging_folder}/work/${staging_hardware_folder}/tools/avr/builtin_tools_versions.txt" message="arduino.avr-gcc=4.8.1-arduino5${line.separator}"/>
+    <!-- XXX: THE FOLLOWING LINES MUST BE RESTORED BEFORE MERGING!
     <echo append="true" file="${staging_folder}/work/${staging_hardware_folder}/tools/avr/builtin_tools_versions.txt" message="arduino.avrdude=${avrdude_version}${line.separator}"/>
     <echo append="true" file="${staging_folder}/work/${staging_hardware_folder}/tools/avr/builtin_tools_versions.txt" message="arduino.avr-gcc=${gcc_version}${line.separator}"/>
+    -->
   </target>
 
   <target name="package-library-index-json-bundle">