This is required on Windows, because in Debug mode, C++ stdlib containers have a different size to when in Release mode, so the code in `node.dll` thought that `node::Environment` was a different size to the code in `electron.exe`, which uh, caused problems.
It should also make debugging through node a bit easier on all platforms.
For some reason the windows node build needs `.dll` on the ends of these libraries, and also needs to be linked against `dbghelp`.
Additionally, copy the `WHOLEARCHIVE` hacks from common.gypi, which was doing the same thing.
