unit tests: fix warnings, build with -Werror

- libsodium: silence warnings
- unit tests: fix warnings
- spiram: fix warnings
- ringbuf test: enable by default, reduce delays

components/heap/test/test_heap_trace.c

@@ -8,13 +8,14 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "esp_heap_trace.h"
 #include "sdkconfig.h"
 #include "unity.h"
 
 #ifdef CONFIG_HEAP_TRACING
 // only compile in heap tracing tests if tracing is enabled
 
+#include "esp_heap_trace.h"
+
 TEST_CASE("heap trace leak check", "[heap]")
 {
     heap_trace_record_t recs[8];