Repair NativeClient support

src/libsodium/randombytes/randombytes.c

@@ -37,7 +37,7 @@ randombytes_init_if_needed(void)
 {
     if (implementation == NULL) {
         implementation = RANDOMBYTES_DEFAULT_IMPLEMENTATION;
-        implementation->stir();
+        randombytes_stir();
     }
 }
 
@@ -78,6 +78,9 @@ randombytes_stir(void)
 {
 #ifndef __EMSCRIPTEN__
     randombytes_init_if_needed();
+    if (implementation->stir != NULL) {
+        implementation->stir();
+    }
 #else
     EM_ASM({
         if (Module.getRandomValue === undefined) {

test/default/randombytes.c

@@ -33,6 +33,8 @@ static int randombytes_tests(void)
 
 #ifdef __EMSCRIPTEN__
     assert(strcmp(randombytes_implementation_name(), "js") == 0);
+#elif defined(__native_client__)
+    assert(strcmp(randombytes_implementation_name(), "nativeclient") == 0);
 #else
     assert(strcmp(randombytes_implementation_name(), "sysrandom") == 0);
 #endif