performance improvement: multiply by pre-computed factor instead

of dividing


[SVN r15583]

libs/random

@@ -1 +1 @@
-Subproject commit 72879cd4d7980305ece0413d82e50058f1d2c7dd
+Subproject commit 83a8e7cc6d9ff19c5bf242364735b5175f01ce4c