fix sourceforge bug 911758: properly instantiate variate_generator<> using a

reference to the base engine


[SVN r26164]

libs/random

@@ -1 +1 @@
-Subproject commit 94de4132a2da9cb9d76efb33c990f580e9d37db9
+Subproject commit 2b360fb849110aef673ea6b0a191e9c566bbc880