Fix gn for skpinfo so it can find vulkan headers.

Change-Id: I25b4751bbf70841666934d17021c507b7cf9c9be
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/419816
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed