[Issue 17868] add pragma(crt_con/destructor)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17868

--- Comment #10 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/dmd

https://github.com/dlang/dmd/commit/276df5b9e95012475077f20a6662a0e386f9d68e
fix Issue 17868 - add pragma(crt_con-/destructor)

- allows to run con-/destructors before/after CRT startup/shutdown
- primary use-case is implementing modular startup in druntime itself

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