Use vec4 for varTexCoord in interlaced shader (#11004)

Somewhen in the past, inTexCoord0 was a vec2. Now, it is a vec4.

client/shaders/3d_interlaced_merge/opengl_fragment.glsl

@@ -6,7 +6,7 @@ uniform sampler2D textureFlags;
 #define rightImage normalTexture
 #define maskImage textureFlags
 
-varying mediump vec2 varTexCoord;
+varying mediump vec4 varTexCoord;
 
 void main(void)
 {

client/shaders/3d_interlaced_merge/opengl_vertex.glsl

@@ -1,4 +1,4 @@
-varying mediump vec2 varTexCoord;
+varying mediump vec4 varTexCoord;
 
 void main(void)
 {