Log Message:
libsodium: updated to 1.0.18

Version 1.0.18
 - The Enterprise versions of Visual Studio are now supported.
 - Visual Studio 2019 is now supported.
 - 32-bit binaries for Visual Studio 2010 are now provided.
 - A test that didn't work properly on Linux systems with overcommit
memory turned on has been removed. This fixes Ansible builds.
 - Emscripten: print and printErr functions are overridden to send
errors to the console, if there is one.
 - Emscripten: UTF8ToString() is now exported since Pointer_stringify()
has been deprecated.
 - Libsodium version detection has been fixed in the CMake recipe.
 - Generic hashing got a 10% speedup on AVX2.
 - New target: WebAssembly/WASI (compile with dist-builds/wasm32-wasi.sh).
 - New functions to map a hash to an edwards25519 point or get a random point:
core_ed25519_from_hash() and core_ed25519_random().
 - crypto_core_ed25519_scalar_mul() has been implemented for scalar*scalar
(mod L) multiplication.
 - Support for the Ristretto group has been implemented, for compatibility
with wasm-crypto.
 - Improvements have been made to the test suite.
 - Portability improvements has been made.
 - getentropy() is now used on systems providing this system call.
 - randombytes_salsa20 has been renamed to randombytes_internal.
 - Support for (p)nacl has been removed.
 - Most ((nonnull)) attributes have been relaxed to allow 0-length inputs
to be NULL.
 - The -ftree-vectorize and -ftree-slp-vectorize compiler switches are
now used, if available, for optimized builds.