merge revision(s) 693e4dec,8d985b18,82e480ff,8f1b6881:

	Prohibit GIT after setting readonly

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	 .appveyor.yml | 1 +
	 1 file changed, 1 insertion(+)

	Clarify the actual Visual Studio version [ci skip]

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	 .appveyor.yml | 3 ++-
	 1 file changed, 2 insertions(+), 1 deletion(-)

	Silent test-all on AppVeyor

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	 .appveyor.yml | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

	Revert vcpkg.exe to previous release [ci skip]

	The latest fails to extract downloaded zip files.
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	 .appveyor.yml | 1 +
	 1 file changed, 1 insertion(+)