[Issue 19194] version for `-mscrtlib` specification

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19194

--- Comment #5 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/dmd

https://github.com/dlang/dmd/commit/0563a79dc81366236cbda77eada43ea98761310d
Fixes Issue 19194 - version for `-mscrtlib` specification

Add __CXXLIB__ predefined enum.

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