export the idl files for exthandler

build/mac/NGLayoutBuildList.pm

@@ -1118,6 +1118,7 @@ sub BuildClientDist()
     
     #URILOADER
     _InstallFromManifest(":mozilla:uriloader:base:MANIFEST_IDL",                    "$distdirectory:idl:");
+    _InstallFromManifest(":mozilla:uriloader:exthandler:MANIFEST_IDL",              "$distdirectory:idl:");
     
     #NETWERK
     _InstallFromManifest(":mozilla:netwerk:base:public:MANIFEST",                   "$distdirectory:netwerk:");