Don't allow DELPHI2009ROOT and DELPHIXEROOT to be both set. #217.

compile-unicode.bat

@@ -24,6 +24,7 @@ set DELPHI2009ROOT=
 set DELPHIXEROOT=
 call .\compilesettings.bat
 if "%DELPHI2009ROOT%"=="" if "%DELPHIXEROOT%"=="" goto compilesettingserror
+if not "%DELPHI2009ROOT%"=="" if not "%DELPHIXEROOT%"=="" goto compilesettingserror
 
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