OEMCrypto v18.3

Updates to OEMCrypto API, OPK, ODK, and unit tests.

See the file CHANGELOG.md for details.

util/include/string_format.h

@@ -13,6 +13,11 @@ namespace wvutil {
 #endif
 bool FormatString(std::string* out, const char* fmt, ...);
 
+#ifdef __GNUC__
+[[gnu::format(printf, 2, 0)]]
+#endif
+bool VFormatString(std::string* out, const char* fmt, va_list vlist);
+
 }  // namespace wvutil
 
 #endif  // WVCDM_UTIL_STRING_FORMAT_H_