build: [gn win] link against static crt in non-component builds (#610)
build: [gn win] link against static crt in non-component builds (#610)

Fixes link errors of the form:
```
node.lib(node_lib.Protocol.obj) : error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MT_StaticRelease' doesn't match value 'MD_DynamicRelease' in atom_main.obj
```

This is because in the GN build, node is linked statically instead of
dynamically in non-component builds.
electron/libchromiumcontent,electron/libchromiumcontent,atom/libchromiumcontent,atom/libchromiumcontent