fixed linker errors->mingw64 (drogonframework#2411)

Author: adithyahk46

cmake_modules/FindHiredis.cmake

@@ -38,4 +38,8 @@ if(Hiredis_FOUND)
             "${HIREDIS_INCLUDE_DIRS}"
             INTERFACE_LINK_LIBRARIES
             "${HIREDIS_LIBRARIES}")
-endif(Hiredis_FOUND)
+endif(Hiredis_FOUND)
+
+if(WIN32 AND MINGW)
+        target_link_libraries(Hiredis_lib INTERFACE ws2_32 secur32 crypt32 bcrypt zstd curl shlwapi)
+endif()