fix "left shift >= width of type" warnings; they point out real problems

avoid other warnings


[SVN r15800]

libs/random

@@ -1 +1 @@
-Subproject commit 881dcb2e9924debafb25cfdce9dcdfec29ca73eb
+Subproject commit 7d4f6ec1abce7350449dc4c958ef22d803c99834