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e31bc147 - In readme.md, clarify that VS Community Edition must be installed with the 'Windows XP Support' option to get the Windows SDK 7.1a prerequisite installed.

In readme.md, clarify that VS Community Edition must be installed with the 'Windows XP Support' option to get the Windows SDK 7.1a prerequisite installed. In readme.md, clarify that VS Community Edition must be installed with the 'Windows XP Support' option to get the Windows SDK 7.1a prerequisite installed. Fixes #6120