Make optimized debug builds link against debug CRT.

Make optimized debug builds link against debug CRT.

We recently had some XP issues on chromium.win after https://codereview.chromium.org/19384011/. 

This might fix it - quote: "The most likely cause of the problem is a gyp (or similar) change that resulted in v8.dll linking against the release version of the crt (for a debug build). There are two MS VC related files: the crt and the c++ std lib (MSVCR100.DLL and MSVCP100D.DLL). The former is set to release, the latter to debug."

I am not entirely sure if this change fits to the linker options for debug level 2.

R=jkummerow@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16026

[Jakob Kummerow, 2013-08-02 09:05:41]

lgtm

[Michael Achenbach, 2013-08-02 10:59:31]

Committed patchset #1 manually as r16026 (presubmit successful).

[Dirk Pranke, 2013-08-02 18:19:07]

On 2013/08/02 10:59:31, machenbach wrote:
> Committed patchset #1 manually as r16026 (presubmit successful).

We're not yet using v8_optimized_debug=2 in chromium, so I doubt this change
would have any effect. Regardless, I think it is the right thing to do (I've
been worried about this and meaning to test it myself but didn't have time over
the past couple days). I will definitely be poking at this today.