Trigger the 'Please update your hxcpp' message to deal with the c++11 changes

Author: hughsando

toolchain/haxe-target.xml

@@ -1,7 +1,7 @@
 <xml>
 
 <!-- make sure hxcpp.n is up to date -->
-<pleaseUpdateHxcppTool version="7" />
+<pleaseUpdateHxcppTool version="8" />
 
 <pragma once="true" />
 

tools/hxcpp/BuildTool.hx

@@ -2459,7 +2459,7 @@ class BuildTool
    public function checkToolVersion(inVersion:String)
    {
       var ver = Std.parseInt(inVersion);
-      if (ver>7)
+      if (ver>8)
          Log.error("Your version of hxcpp.n is out-of-date.  Please update by compiling 'haxe compile.hxml' in hxcpp/tools/hxcpp.");
    }