Slightly revamp dist-build/ios.sh - Compile arm32 and arm64 targets separately - Compile for the iOS simulator
Slightly revamp dist-build/ios.sh
- Compile arm32 and arm64 targets separately
- Compile for the iOS simulator

The resulting fat library include arm32, arm64, 32-bit simulator and
64-bit OSX targets.

This is a bit better than what we previously had regarding the simulator,
but still not optimal, as the 64-bit simulator version should also be
included. However, a fat library cannot include both the 64-bit simulator
version and a version for OSX since the architecture is the same.

The proper way to address this is probably to generate two libraries.
This requires some prior changes to Swift-Sodium.

soumith/libsodium,netroby/libsodium,Payshares/libsodium,GreatFruitOmsk/libsodium,pyparallel/libsodium,zhuqling/libsodium,tml/libsodium,paragonie-scott/libsodium,HappyYang/libsodium,zhuqling/libsodium,pmienk/libsodium,JackWink/libsodium,soumith/libsodium,mvduin/libsodium,donpark/libsodium,HappyYang/libsodium,rustyhorde/libsodium,pmienk/libsodium,eburkitt/libsodium,pmienk/libsodium,rustyhorde/libsodium,GreatFruitOmsk/libsodium,CyanogenMod/android_external_dnscrypt_libsodium,netroby/libsodium,GreatFruitOmsk/libsodium,eburkitt/libsodium,soumith/libsodium,tml/libsodium,zhuqling/libsodium,netroby/libsodium,CyanogenMod/android_external_dnscrypt_libsodium,HappyYang/libsodium,Payshares/libsodium,kytvi2p/libsodium,donpark/libsodium,kytvi2p/libsodium,JackWink/libsodium,paragonie-scott/libsodium,kytvi2p/libsodium,pyparallel/libsodium,mvduin/libsodium,mvduin/libsodium,rustyhorde/libsodium,CyanogenMod/android_external_dnscrypt_libsodium,rustyhorde/libsodium,paragonie-scott/libsodium,tml/libsodium,pyparallel/libsodium,donpark/libsodium,eburkitt/libsodium,Payshares/libsodium,JackWink/libsodium