swift234

Remove linking CrashReportClient.a until the CMake logic is refined to be portable.

Currently this prevents building Swift on 10.9.

Right now CrashReportClient.a is used regardless of the SDK being used,
and the CMake logic does a check for the .a across different platforms
and SDKs without checking what the build product target OS actually is.
The current logic somewhat works because the SDKs will be in different
Platforms, but it is fragile.

Swift SVN r16678