Fix launch4j extraction if cross compiling from linux

Author: facchinm

build/build.xml

@@ -899,6 +899,10 @@
     <echo>Untarring ${archive_file} into folder ${dest_folder}</echo>
     <untar src="${archive_file}" dest="${dest_folder}" compression="bzip2"/>
   </target>
+  <target name="untar-gzip" depends="untar-unzip-checksum" unless="${archive_file}_installed">
+    <echo>Untarring ${archive_file} into folder ${dest_folder}</echo>
+    <untar src="${archive_file}" dest="${dest_folder}" compression="gzip"/>
+  </target>
 
   <target name="unzip" depends="untar-unzip-checksum" unless="${archive_file}_installed">
     <echo>Unzipping ${archive_file} into folder ${dest_folder}</echo>
@@ -989,12 +993,15 @@
   </target>
 
   <target name="download-launch4j-linux">
-    <antcall target="untar">
+    <antcall target="untar-gzip">
       <param name="archive_file" value="windows/launch4j-3.9-linux.tgz"/>
       <param name="archive_url" value="https://downloads.arduino.cc/tools/launch4j-3.9-linux.tgz"/>
       <param name="final_folder" value="windows/launcher/launch4j"/>
       <param name="dest_folder" value="windows/launcher/"/>
     </antcall>
+    <antcall target="make-file-executable">
+      <param name="file" value="windows/launcher/launch4j/bin/*" />
+    </antcall>
   </target>
 
   <target name="windows-build"