[FAB-4955] Update doc for building on Windows
[FAB-4955] Update doc for building on Windows

This patch changes the prerequisites for Windows 7 to successfully
build Fabric (both binaries and docker images).

Signed-off-by: Arnaud J Le Hors <336b2f4fb14e0a6aba0291ba81894e387297584e@us.ibm.com>

manish-sethi/fabric,binhn/fabric,jimthematrix/fabric,muralisrini/fabric,binhn/fabric,manish-sethi/fabric-sidedb,hyperledger/fabric,manish-sethi/fabric,binhn/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,stemlending/fabric,muralisrini/fabric,manish-sethi/fabric-sidedb,hyperledger/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,muralisrini/fabric,jimthematrix/fabric