vulkan/overlay: fix includes

The Loader/Validation-Layers repository allow the user to choose where
header files are installed. On my system I choose /usr/include
thinking it was the obvious "base" location, but it turns out the
headers end up being installed right there rather in a vulkan
subdirectory. On Debian/Ubuntu the selected installation path is
/usr/include/vulkan, so just go with that.

Hopefully other distro don't choose another path.

Note that the validation layer doesn't provide a .pc file so we have
no way of querying where the headers are installed.

Signed-off-by: Lionel Landwerlin <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109739
Acked-by: Eric Engestrom <[email protected]>

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