Fix entrypoint for CopyMemory

Author: GeorgRottensteiner

Common/Common/FastImage.cs

@@ -174,11 +174,12 @@ public override bool Equals( object Object )
     static extern bool InvalidateRect( IntPtr hWnd, IntPtr lpRect, bool bErase );
     [DllImport( "user32.dll" )]
     static extern bool ValidateRect( IntPtr hWnd, ref GR.Image.FastImage.RECT lpRect );
+
 #if NET5_0_OR_GREATER
     [DllImport( "Kernel32.dll", EntryPoint = "RtlCopyMemory" )]
 #else
     [DllImport( "Kernel32.dll", EntryPoint = "CopyMemory" )]
-#endif
+    #endif
     static extern void CopyMemory( IntPtr dest, IntPtr src, uint length );
 
     [DllImport( "user32.dll" )]

Common/Common/MemoryImage.cs

@@ -235,8 +235,13 @@ static int PaletteSize( BITMAPINFOHEADER InfoHeader )
       return DIBNumColors( InfoHeader ) * System.Runtime.InteropServices.Marshal.SizeOf( typeof( RGBQUAD ) );
     }
 
+#if NET5_0_OR_GREATER
     [DllImport( "Kernel32.dll", EntryPoint = "RtlCopyMemory" )]
+#else
+    [DllImport( "Kernel32.dll", EntryPoint = "CopyMemory" )]
+#endif
     static extern void CopyMemory( IntPtr dest, IntPtr src, uint length );
+
     [DllImport( "kernel32.dll" )]
     static extern IntPtr GlobalLock( IntPtr hMem );
     [DllImport( "kernel32.dll" )]