BigNumbers support is missing on Android classpath

[JustAMan]

Per the now-closed issue #5:

BigInteger bi = BigInteger.valueOf(0);

results in

java/lang/UnsatisfiedLinkError: java/math/NativeBN.BN_new()J
  at java/math/NativeBN.BN_new (native)
  at java/math/BigInt.makeValid (line 51)
  at java/math/BigInt.putULongInt (line 85)
  at java/math/BigInteger.<init> (line 103)
  at java/math/BigInteger.<clinit> (line 66)