It should not assign to the env variable

[shuse2]

Expected behavior

In the code, it should never insert value to environment variable

Actual behavior

In cryptography, it is inserting the environment variable, and fails on the webpack build
https://github.com/LiskHQ/lisk-sdk/blob/master/elements/lisk-cryptography/src/nacl/index.ts#L28

Which version(s) does this affect? (Environment, OS, etc...)

3.0-