Context3D: fix internal shaders to use #pragma header.

Author: MAJigsaw77

src/openfl/display/_internal/Context3DAlphaMaskShader.hx

@@ -12,9 +12,7 @@ class Context3DAlphaMaskShader extends Shader
 {
 	public static var opaqueBitmapData:BitmapData = new BitmapData(1, 1, false, 0);
 
-	@:glFragmentSource("varying vec2 openfl_TextureCoordv;
-
-		uniform sampler2D openfl_Texture;
+	@:glFragmentSource("#pragma header
 
 		void main(void) {
 
@@ -31,11 +29,7 @@ class Context3DAlphaMaskShader extends Shader
 			}
 
 		}")
-	@:glVertexSource("attribute vec4 openfl_Position;
-		attribute vec2 openfl_TextureCoord;
-		varying vec2 openfl_TextureCoordv;
-
-		uniform mat4 openfl_Matrix;
+	@:glVertexSource("#pragma header
 
 		void main(void) {
 

src/openfl/display/_internal/Context3DMaskShader.hx

@@ -12,9 +12,7 @@ class Context3DMaskShader extends Shader
 {
 	public static var opaqueBitmapData:BitmapData = new BitmapData(1, 1, false, 0);
 
-	@:glFragmentSource("varying vec2 openfl_TextureCoordv;
-
-		uniform sampler2D openfl_Texture;
+	@:glFragmentSource("#pragma header
 
 		void main(void) {
 
@@ -31,11 +29,7 @@ class Context3DMaskShader extends Shader
 			}
 
 		}")
-	@:glVertexSource("attribute vec4 openfl_Position;
-		attribute vec2 openfl_TextureCoord;
-		varying vec2 openfl_TextureCoordv;
-
-		uniform mat4 openfl_Matrix;
+	@:glVertexSource("#pragma header
 
 		void main(void) {