disable Vulkan for Windows 7 (tdf#138219)

The bugreport says the latest Intel drivers for Windows 7 are
problematic, and since Windows 7 is EOL anyway, simply don't bother.

Change-Id: Iee429d99ebf9b0e0a99a50c38ef77d06ab5b797b
diff --git a/vcl/skia/skia_denylist_vulkan.xml b/vcl/skia/skia_denylist_vulkan.xml
index 8c01a095..507bc04 100644
--- a/vcl/skia/skia_denylist_vulkan.xml
+++ b/vcl/skia/skia_denylist_vulkan.xml
@@ -30,5 +30,8 @@
        <entry os="windows" vendor="nvidia" compare="less" version="457.36.0">
            <device id="all"/>
        </entry>
        <entry os="7" vendor="all">
            <device id="all"/>
        </entry>
    </denylist>
</root>