[gtk+] vulkan: Quiet another validation warning

[Matthias Clasen <matthiasc src gnome org>]

commit 9a1460218c04c53a13197d65c80913c6df340c8c
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Sep 21 12:05:00 2017 -0400

    vulkan: Quiet another validation warning
    
    It complains if a vertex shader has an out that is not matched
    to an in of the fragment shader.

 gsk/resources/vulkan/outset-shadow.frag |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gsk/resources/vulkan/outset-shadow.frag b/gsk/resources/vulkan/outset-shadow.frag
index 419e458..30b0f9d 100644
--- a/gsk/resources/vulkan/outset-shadow.frag
+++ b/gsk/resources/vulkan/outset-shadow.frag
@@ -10,6 +10,7 @@ layout(location = 3) in flat vec4 inOutlineCornerHeights;
 layout(location = 4) in flat vec4 inColor;
 layout(location = 5) in flat vec2 inOffset;
 layout(location = 6) in flat float inSpread;
+layout(location = 7) in flat float inBlurRadius;
 
 layout(location = 0) out vec4 color;