Define WIN32_LEAN_AND_MEAN conditionally.
Define WIN32_LEAN_AND_MEAN conditionally.

Fixes: https://github.com/nodejs/node-gyp/issues/823
PR-URL: https://github.com/nodejs/node-gyp/pull/824
Reviewed-By: Bert Belder <9f2ff180696da386c1be31b4507155616db25dc6@gmail.com>

nodejs/node-gyp,saper/node-gyp,nodejs/node-gyp,TooTallNate/node-gyp,isaacs/node-gyp,nodegit/node-gyp,CodeJockey/node-ninja,Fishrock123/node-gyp,TooTallNate/node-gyp,isaacs/node-gyp,nodegit/node-gyp,purplecode/node-gyp,nodegit/node-gyp,nodegit/node-gyp,nodejs/node-gyp,CodeJockey/node-ninja,refack/node-gyp,vany-egorov/node-gyp,TooTallNate/node-gyp,vany-egorov/node-gyp,purplecode/node-gyp,nodegit/node-gyp,purplecode/node-gyp,refack/node-gyp,isaacs/node-gyp,nodejs/node-gyp,nodejs/node-gyp,refack/node-gyp,saper/node-gyp,refack/node-gyp,refack/node-gyp,Fishrock123/node-gyp,nwjs/nw-gyp,isaacs/node-gyp,Fishrock123/node-gyp,CodeJockey/node-ninja,TooTallNate/node-gyp,iarna/node-gyp,iarna/node-gyp,CodeJockey/node-ninja,purplecode/node-gyp,purplecode/node-gyp,nwjs/nw-gyp,iarna/node-gyp,saper/node-gyp,vany-egorov/node-gyp,nwjs/nw-gyp,iarna/node-gyp,vany-egorov/node-gyp,nwjs/nw-gyp,TooTallNate/node-gyp,saper/node-gyp,saper/node-gyp,iarna/node-gyp,isaacs/node-gyp,CodeJockey/node-ninja,nwjs/nw-gyp,Fishrock123/node-gyp