Fixes shader errors reported by Auria

data/shaders/instanciedgrassshadow.vert

@@ -17,6 +17,7 @@ layout(location = 8) in vec3 Orientation;
 layout(location = 9) in vec3 Scale;
 #else
 in vec3 Position;
+in vec4 Color;
 in vec2 Texcoord;
 
 in vec3 Origin;

data/shaders/rsm.vert

@@ -8,11 +8,17 @@ uniform mat4 TextureMatrix =
          0., 0., 1., 0.,
          0., 0., 0., 1.);
 
-
+#if __VERSION__ >= 330
 layout(location = 0) in vec3 Position;
 layout(location = 1) in vec3 Normal;
 layout(location = 2) in vec4 Color;
 layout(location = 3) in vec2 Texcoord;
+#else
+in vec3 Position;
+in vec3 Normal;
+in vec4 Color;
+in vec2 Texcoord;
+#endif
 
 out vec3 nor;
 out vec2 uv;

data/shaders/shadow.vert

@@ -9,8 +9,13 @@ layout (std140) uniform MatrixesData
 
 uniform mat4 ModelMatrix;
 
+#if __VERSION__ >= 330
 layout(location = 0) in vec3 Position;
 layout(location = 3) in vec2 Texcoord;
+#else
+in vec3 Position;
+in vec2 Texcoord;
+#endif
 
 #ifdef VSLayer
 out vec2 uv;

data/shaders/shadow_grass.vert

@@ -10,9 +10,15 @@ layout (std140) uniform MatrixesData
 uniform mat4 ModelMatrix;
 uniform vec3 windDir;
 
+#if __VERSION__ >= 330
 layout(location = 0) in vec3 Position;
 layout(location = 2) in vec4 Color;
 layout(location = 3) in vec2 Texcoord;
+#else
+in vec3 Position;
+in vec4 Color;
+in vec2 Texcoord;
+#endif
 
 #ifdef VSLayer
 out vec2 uv;