[Issue 19575] core.cpuid not usable without a runtime

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19575

--- Comment #2 from ponce <aliloko at gmail.com> ---
Well I want to use the core.cpuid in druntime, not the one in a library
rewrite. I also use a library rewrite, but other parts of Phobos are affected
by this lack of core.cpuid

Besides other problems of mir.cpuid:
- it depends on mir-core
- ...with a dependency version version="<0.3.0" which precludes bugfix for new
compilers, why not use ~> 
  In SemVer major version 0 means "unstable" which means mir-core doesn't have
a stability guarantee? If it has, please tag a v1.0.0
- mir-core and mir-cpuid are tested with current/latest LDC and DMD but I do
use older compilers all the time. I can't depend on a DUB package that will
break compiler that are less than one year ago.

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