vulkan: No need to redefine gl_PerVertex

The compiler has those predefined, so use them.

gsk/resources/vulkan/blendmode.vert

@@ -12,10 +12,6 @@ layout(location = 1) out vec2 outStartTexCoord;
 layout(location = 2) out vec2 outEndTexCoord;
 layout(location = 3) flat out uint outBlendMode;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/blur.vert

@@ -12,10 +12,6 @@ layout(location = 1) out flat vec2 outSize;
 layout(location = 2) out vec2 outTexCoord;
 layout(location = 3) out flat float outRadius;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/border.vert

@@ -15,10 +15,6 @@ layout(location = 3) out flat vec4 outCornerWidths;
 layout(location = 4) out flat vec4 outCornerHeights;
 layout(location = 5) out flat vec4 outBorderWidths;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/color-matrix.vert

@@ -12,10 +12,6 @@ layout(location = 1) out vec2 outTexCoord;
 layout(location = 2) out flat mat4 outColorMatrix;
 layout(location = 6) out flat vec4 outColorOffset;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/color.vert

@@ -8,10 +8,6 @@ layout(location = 1) in vec4 inColor;
 layout(location = 0) out vec2 outPos;
 layout(location = 1) out flat vec4 outColor;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/crossfade.vert

@@ -12,10 +12,6 @@ layout(location = 1) out vec2 outStartTexCoord;
 layout(location = 2) out vec2 outEndTexCoord;
 layout(location = 3) out float outProgress;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/inset-shadow.vert

@@ -18,10 +18,6 @@ layout(location = 4) out flat vec4 outColor;
 layout(location = 5) out flat vec2 outOffset;
 layout(location = 6) out flat float outSpread;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/linear.vert

@@ -29,10 +29,6 @@ layout(location = 2) out flat int outRepeating;
 layout(location = 3) out flat int outStopCount;
 layout(location = 4) out flat ColorStop outStops[8];
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/mask.vert

@@ -10,10 +10,6 @@ layout(location = 0) out vec2 outPos;
 layout(location = 1) out vec2 outTexCoord;
 layout(location = 2) out flat vec4 outColor;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/outset-shadow.vert

@@ -19,10 +19,6 @@ layout(location = 5) out flat vec2 outOffset;
 layout(location = 6) out flat float outSpread;
 layout(location = 7) out flat float outBlurRadius;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),

gsk/resources/vulkan/texture.vert

@@ -8,10 +8,6 @@ layout(location = 1) in vec4 inTexRect;
 layout(location = 0) out vec2 outPos;
 layout(location = 1) out vec2 outTexCoord;
 
-out gl_PerVertex {
-  vec4 gl_Position;
-};
-
 vec2 offsets[6] = { vec2(0.0, 0.0),
                     vec2(1.0, 0.0),
                     vec2(0.0, 1.0),