Fixed GPLv2 license issue

Doing this from work via GitHub - Sorry for not combining with previous commits

src/citra_qt/qt-build.targets

@@ -1,4 +1,9 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Copyright 2010 Daher Alfawares
+Licensed under GPLv2
+Refer to the license.txt file included.
+-->
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
     <PropertyPageSchema
@@ -239,4 +244,4 @@
     <MakeDir
       Directories="@(QRCDirsToMake-&gt;'%(RootDir)%(Directory)')" />
   </Target>
-</Project>
+</Project>