Fixed GPLv2 license issue

src/citra_qt/qt-build.props

@@ -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">
   <PropertyGroup
     Condition="'$(UICBeforeTargets)' == '' and '$(UICAfterTargets)' == '' and '$(ConfigurationType)' != 'Makefile'">
@@ -53,4 +58,4 @@
       <ExecutionDescription>%(FileName).qrc</ExecutionDescription>
     </QRC>
   </ItemDefinitionGroup>
-</Project>
+</Project>