silence a warning in WolfSSL.

There is a warning about inconsistency between function definition
and prototype.

See https://github.com/wolfSSL/wolfssl/issues/2752

Disable specific MSVC warning for now.

extra/wolfssl/CMakeLists.txt

@@ -39,7 +39,7 @@ ADD_DEFINITIONS(-DWOLFSSL_LIB -DBUILDING_WOLFSSL)
 INCLUDE_DIRECTORIES(BEFORE ${CMAKE_CURRENT_SOURCE_DIR}/wolfssl)
 IF(MSVC)
   # size_t to long truncation warning
-  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -wd4267 -wd4334")
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -wd4267 -wd4334 -wd4028")
 ENDIF()
 
 ADD_CONVENIENCE_LIBRARY(wolfssl ${WOLFSSL_SOURCES})