Enable exporting of Windows applications on ARM

Steps to compile ld & windres:
sudo aptitude install mingw-w64
wget https://ftp.gnu.org/gnu/binutils/binutils-2.30.tar.bz2
cd binutils-2.30
./configure --target=i686-w64-mingw32
make -j4 -l4
sudo make install

build/build.xml

@@ -45,6 +45,7 @@
     <property name="jre.download.jdk" value="true" />
     <property name="jre.downloader" value="linux-arm32-vfp-hflt.tar.gz" />
     <property name="linux.dist" value="linux/processing-${version}-linux-armv6hf.tgz" />
+    <property name="launch4j.variant" value="linux-armv6hf" />
   </target>
   <target name="check-linux-arm64" if="linux-arm64">
     <property name="jre.download.jdk" value="true" />
@@ -798,11 +799,13 @@
 
     <property name="launch4j.dir"
               value="linux/work/modes/java/application/launch4j" />
+    <!-- this might be already overwritten by check-linux-arm32 -->
+    <property name="launch4j.variant" value="linux" />
 
     <!-- rename the version we need -->
-    <move file="${launch4j.dir}/bin/windres-linux"
+    <move file="${launch4j.dir}/bin/windres-${launch4j.variant}"
           tofile="${launch4j.dir}/bin/windres" />
-    <move file="${launch4j.dir}/bin/ld-linux"
+    <move file="${launch4j.dir}/bin/ld-${launch4j.variant}"
           tofile="${launch4j.dir}/bin/ld" />
 
     <!-- make executable (ant doesn't preserve) -->