Squashed PRNG workarounds [2/3]

Workarounds based on the following:
http://android-developers.blogspot.pt/2013/08/some-securerandom-thoughts.html
https://github.com/CyanogenMod/android_libcore/commit/d5296a7ed1ffc49392e9b37aeebdec4799382bf8
https://github.com/CyanogenMod/android_libcore/commit/9d53ecffc6a3ee4f47601d09e51d1b1c2e19c42d

Nice work Soo Hyeon Kim, Daewan Han of ETRI and Dong Hoon Lee of Korea University,
and RMCC of CyanogenMod