[Issue 12615] Warn against, and then deprecate old alias syntax

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12615

--- Comment #9 from Sobirari Muhomori <dfj1es...@sneakemail.com> ---
Probably leave multialias declaration valid, it's quite handy:
alias HANDLE BCRYPT_HANDLE, BCRYPT_ALG_HANDLE, BCRYPT_KEY_HANDLE,
BCRYPT_HASH_HANDLE, BCRYPT_SECRET_HANDLE;

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