Misc Fixes

- Code protection fixes for v18
- Fix MSVC error with static_assert
- Fix RSA with Cobalt
- Workaround SCP errors with string concatenation
    - Use snprintf instead

Merged from https://widevine-internal-review.googlesource.com/183190

Change-Id: If2e9ee3403e313fd8c7dffccca6f8d3f7b0b0afb

libwvdrmengine/oemcrypto/include/level3_file_system.h

@@ -12,6 +12,7 @@
 #define LEVEL3_FILE_SYSTEM_H_
 
 #include <stdlib.h>
+#include "platform.h"
 
 namespace wvoec3 {
 

libwvdrmengine/oemcrypto/odk/src/odk_assert.h

@@ -9,7 +9,7 @@
 extern "C" {
 #endif
 
-#if (__STDC_VERSION__ >= 201112L)
+#if defined(_MSC_VER) || (__STDC_VERSION__ >= 201112L)
 #include <assert.h>
 #define odk_static_assert static_assert
 #else