Don't install new Immersive skin on Windows 7

It uses metro colors so it works only on Win8+.

#1866 (comment)

Author: ge0rdi

Src/Setup/Setup.wxs

@@ -538,9 +538,11 @@
 			</Component>
 			<Component Id="Immersive.skin" Guid="045C48C3-FE11-4C66-AD7F-3F3EE35B4DEA" Win64="$(var.CS_WIN64)">
 				<File Id="Immersive.skin" KeyPath="yes" Checksum="yes" Source="Output\Immersive.skin" Vital="yes" />
+				<Condition>VersionNT&gt;601</Condition>
 			</Component>
 			<Component Id="Immersive.skin7" Guid="FFECA17A-C005-4D84-9F7C-DBC8EA2E1B5A" Win64="$(var.CS_WIN64)">
 				<File Id="Immersive.skin7" KeyPath="yes" Checksum="yes" Source="Output\Immersive.skin7" Vital="yes" />
+				<Condition>VersionNT&gt;601</Condition>
 			</Component>
 		</DirectoryRef>
 		<DirectoryRef Id="TARGETDIR">