Arm 64 build local configure for now, adding 32bit native sourceset, not connected yet

sodiumWrapper/configureLinuxArm64.sh

@@ -0,0 +1,8 @@
+#! /bin/sh
+export PREFIX="$(pwd)/libsodium-ios"
+export CC=/usr/bin/aarch64-linux-gnu-gcc
+export TARGET_ARCH=armv8-a
+export CFLAGS="-Os -march=${TARGET_ARCH}"
+cd libsodium
+./configure  --prefix=$PREFIX --host=aarch64-linux-gnu-gcc --with-sysroot=/home/ionspin/.konan/dependencies/target-sysroot-1-linux-glibc-arm64/ "$@"
+