winbuild/README: document how to clean a build #15291
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Add a new section explaining that a build can be cleaned by adding the keyword "clean" to the build command.
Add an example of using the "x64 Native Tools" prompt to the VS command prompt section.
Update the Legacy Windows section's lack-of-cipher support warning to say "Windows 8 and earlier" instead of "Windows XP and earlier."
Ref: #15277
Closes #xxxx