[Issue 21938] importC: Support __attribute__ specifiers that could be mapped to D attributes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21938

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Walter Bright <bugzilla at digitalmars.com> ---
Currently doing all but `access`. The access modes are read_only, read_write,
write_only, or none.

https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html

None of those access modes are supported in detail by D semantics, the best we
can do without adding more D semantics is to simply ignore them, which is done
today.

I.e. there isn't much value in implementing `access`. I'm going to write the
rest as "FIXED" and `access` as WONTFIX.

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