Fix issue with incorrect native libraries for the JNA.

The JNA jar as provided by the Maven Central does not contain valid
Android libraries. The project provides Android-suitable libraries in
their GitHub repo:
https://github.com/java-native-access/jna/tree/master/lib/native

Author: astonbitecode

java/pom.xml

@@ -32,6 +32,11 @@
 			<artifactId>jna</artifactId>
 			<version>${jna.version}</version>
 		</dependency>
+		<dependency>
+			<groupId>net.java.dev.jna</groupId>
+			<artifactId>android-arm</artifactId>
+			<version>${jna.version}</version>
+		</dependency>
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
@@ -68,6 +73,24 @@
 					<target>1.7</target>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-dependency-plugin</artifactId>
+				<executions>
+					<execution>
+						<id>resource-dependencies</id>
+						<phase>process-sources</phase>
+						<goals>
+							<goal>unpack-dependencies</goal>
+						</goals>
+						<configuration>
+							<includeArtifactIds>android-arm</includeArtifactIds>
+							<includes>libjnidispatch.so</includes>
+							<outputDirectory>libs/armeabi</outputDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 		</plugins>
 		<pluginManagement>
 			<plugins>

rust-build/libs/android-arm.jar

@@ -28,14 +28,18 @@ cd android-toolchain
 ANDROID_TOOLCHAIN_DIR=`pwd`
 echo Android toolchain set in $ANDROID_TOOLCHAIN_DIR
 
+# Install the jar containing the jna native library for Android (taken from https://github.com/java-native-access/jna/tree/master/lib/native)
+echo "Installing jar android-arm.jar in the local Maven... This jar is not provided in the Maven Central, rather by the project's GitHub repo."
+mvn org.apache.maven.plugins:maven-install-plugin:2.5.2:install-file -Dfile=${BASEDIR}/rust-build/libs/android-arm.jar -DgroupId=net.java.dev.jna -DartifactId=android-arm -Dversion=4.4.0 -Dpackaging=jar
+
 # Go to the .cargo directory
 cd $BASEDIR/rust
 mkdir .cargo
 cd .cargo
 CURR_DIR=`pwd`
 echo Entered directory $CURR_DIR
 
-#Create a config file
+# Create a config file
 cat > config << EOF
 [target]
 [target.arm-linux-androideabi]