Use native Argon2 implementation

src/build-scripts/build-all.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 set -e
 
+echo '*****************************************'
+echo '******* Building native libraries *******'
+echo '*****************************************'
+./build-native.sh
+
 echo '*****************************************'
 echo '********** Building Java parts **********'
 echo '*****************************************'

src/build-scripts/build-native.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -e
+
+pushd ../java/argon2
+ndk-build
+popd