OEMCrypto v16.1 -- update ODK

This CL updates the ODK library to address review comments.

util/src/cdm_random.cpp

@@ -46,9 +46,9 @@ void CdmRandomGenerator::Seed(unsigned int s) {
   generator_.seed(s);
 }
 
-int CdmRandomGenerator::Rand() {
+unsigned int CdmRandomGenerator::Rand() {
   CdmRandomLock lock(generator_lock_);
-  std::uniform_int_distribution<int> dist(0, RAND_MAX);
+  std::uniform_int_distribution<unsigned int> dist(0, RAND_MAX);
   return dist(generator_);
 }