Conditionalize use of <cpuid.h> header

Conditionalize use of <cpuid.h> header

This header only exists for x86 environments, but was included
unconditionally.  That broke the builds for all non-x86 environments.

R=mark@chromium.org
BUG=

Committed: https://code.google.com/p/google-breakpad/source/detail?r=1253

[Mark Mentovai]

LGTM.

The use of cpuid is wrong, anyway. See https://breakpad.appspot.com/834003/ ,
which fixes it. If the suggestion I made on that review is taken, this wouldn’t
even need <cpuid.h> at all.

[Roland McGrath]

On 2013/12/10 18:02:29, Mark Mentovai wrote:
> LGTM.
> 
> The use of cpuid is wrong, anyway. See https://breakpad.appspot.com/834003/ ,
> which fixes it. If the suggestion I made on that review is taken, this
wouldn’t
> even need <cpuid.h> at all.

You're right about that (I happen to be the former maintainer of ptrace in
Linux, so I know more than anyone should about that stuff).  But I'll leave that
to you all and just do this change that fixes the immediate build breakage.

[Mark Mentovai]

That works for me.

[Roland McGrath]

Conditionalize use of <cpuid.h> header

This header only exists for x86 environments, but was included
unconditionally.  That broke the builds for all non-x86 environments.

[Roland McGrath]

Committed patchset #2 manually as r1253 (presubmit successful).