add Windows to the target build platforms
add Windows to the target build platforms

Expeditor uses this to know for which platforms to crank out packages.

https://expeditor.chef.io/docs/patterns/habitat-packages/#bldr-toml

Signed-off-by: Robb Kidd <a629c362624370ec351e141df0bd1d27621ff790@thekidds.org>

chef/chef,MsysTechnologiesllc/chef,higanworks/chef,MsysTechnologiesllc/chef,higanworks/chef,nvwls/chef,mattray/chef,higanworks/chef,tas50/chef-1,higanworks/chef,jaymzh/chef,chef/chef,gene1wood/chef,chef/chef,mwrock/chef,MsysTechnologiesllc/chef,jaymzh/chef,mwrock/chef,mwrock/chef,nvwls/chef,gene1wood/chef,tas50/chef-1,higanworks/chef,tas50/chef-1,gene1wood/chef,nvwls/chef,mattray/chef,mattray/chef,nvwls/chef,jaymzh/chef,nvwls/chef,nvwls/chef,tas50/chef-1,MsysTechnologiesllc/chef,jaymzh/chef,gene1wood/chef,mwrock/chef,chef/chef,mattray/chef,mattray/chef