[Issue 24867] Wrong deprecation warning of @system variable usage under CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24867

--- Comment #2 from Luís Ferreira <contact at lsferreira.net> ---
There's a few flaws/improvements to make here:
1. Misaligned pointers in static immutables that are already initialised are
fine
2. Usage of @system variables in CTFE may be ok (could be implementation
defined, e.g. JIT-based CTFE may also use misaligned pointers, but probably can
be eased on the current implementation)
3. Access of non- at system part of a struct should be @safe.

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