define BOOST_UBLAS_NO_ELEMENT_PROXIES to workaround compilation problems with

the debug_functor on vacpp version 6


[SVN r24143]

libs/numeric/ublas

@@ -1 +1 @@
-Subproject commit 59f8af917bbf8dd801007f8b2ab22767dc57f3af
+Subproject commit a1b98447ec6d92bca712afa90b58d7dbe03f5078