Always use random data from the crypto provider

bin/tests/system/rsabigexponent/bigkey.c

@@ -185,9 +185,7 @@ main(int argc, char **argv) {
 
 	CHECK(isc_mem_create(0, 0, &mctx), "isc_mem_create()");
 	CHECK(isc_entropy_create(mctx, &ectx), "isc_entropy_create()");
-#ifdef ISC_PLATFORM_CRYPTORANDOM
 	isc_entropy_usehook(ectx, ISC_TRUE);
-#endif
 	CHECK(isc_entropy_usebestsource(ectx, &source,
 					"../random.data",
 					ISC_ENTROPY_KEYBOARDNO),