[Issue 22315] ImportC: #pragma pack is not implemented

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22315

--- Comment #3 from Walter Bright <bugzilla at digitalmars.com> ---
https://gcc.gnu.org/onlinedocs/gcc-3.3/gcc/Type-Attributes.html

for:

__attribute__ ((aligned))
__attribute__ ((packed))

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