Make shared libraries be able to link to MSVC static runtime libraries.

[veawor]

DLL linked with MSVC static runtime libraries doesn't require VC runtime at runtime.

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[veawor]

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@googlebot I signed it!

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[acozzette]

It seems like this comment is now out of date since the following code applies even if we're not just building static libraries; could you update the comment?

[veawor]

Yes, you are right, and the comment has been updated accordingly.