contrib/wix: add COPYING.rtf stable

contrib/wix: add COPYING.rtf

Moving the file from the misc directory of the thg-winbuild repo, which
uses mercurial's contrib/wix.

This file is displayed by the install UI sequence, so it belongs to the
WiX sources quite closely.

It happens to be installed by the msi installer, too.

Binary file contrib/wix/COPYING.rtf has changed

--- a/contrib/wix/mercurial.wxs	Fri Feb 26 16:52:43 2010 +0100
+++ b/contrib/wix/mercurial.wxs	Thu Feb 25 14:56:09 2010 +0100
@@ -51,7 +51,7 @@
               <File Id='ReadMe' Name='ReadMe.html' DiskId='1' Source='contrib\win32\ReadMe.html' KeyPath='yes'/>
           </Component>
           <Component Id='COPYING' Guid='B7801DBA-1C49-4BF4-91AD-33C65F5C7895'>
-            <File Id='COPYING' Name='COPYING.rtf' DiskId='1' Source='..\misc\COPYING.rtf' />
+            <File Id='COPYING' Name='COPYING.rtf' DiskId='1' Source='contrib\wix\COPYING.rtf' />
           </Component>
           <Directory Id='HGRCD' Name='hgrc.d'>
             <Component Id='mercurial.rc' Guid='1D5FAEEE-7E6E-43B1-9F7F-802714316B15'>
@@ -115,7 +115,7 @@
     <UIRef Id="WixUI_FeatureTree" />
     <UIRef Id="WixUI_ErrorProgressText" />
 
-    <WixVariable Id="WixUILicenseRtf" Value="..\misc\COPYING.rtf" />
+    <WixVariable Id="WixUILicenseRtf" Value="contrib\wix\COPYING.rtf" />
 
     <Icon Id="hgIcon.ico" SourceFile="contrib/win32/mercurial.ico" />