remove duplicated NextPowerOf2 definition

OpenRA.Renderer.Gl/Texture.cs

@@ -12,6 +12,7 @@ using System;
 using System.Drawing;
 using System.Drawing.Imaging;
 using System.IO;
+using OpenRA.FileFormats;
 using OpenRA.FileFormats.Graphics;
 using Tao.OpenGl;
 
@@ -120,7 +121,7 @@ namespace OpenRA.Renderer.Glsl
 			if (!IsPowerOf2(bitmap.Width) || !IsPowerOf2(bitmap.Height))
 			{
 				//throw new InvalidOperationException( "non-power-of-2-texture" );
-				bitmap = new Bitmap(bitmap, new Size(NextPowerOf2(bitmap.Width), NextPowerOf2(bitmap.Height)));
+				bitmap = new Bitmap(bitmap, new Size(Exts.NextPowerOf2(bitmap.Width), Exts.NextPowerOf2(bitmap.Height)));
 			}
 			
 			var bits = bitmap.LockBits(
@@ -141,16 +142,5 @@ namespace OpenRA.Renderer.Glsl
 		{
 			return (v & (v - 1)) == 0;
 		}
-
-		int NextPowerOf2(int v)
-		{
-			--v;
-			v |= v >> 1;
-			v |= v >> 2;
-			v |= v >> 4;
-			v |= v >> 8;
-			++v;
-			return v;
-		}
 	}
 }