Fix msys compilation error in scheme.c.
Fix msys compilation error in scheme.c.

CppMicroServices/CppMicroServices,saschazelzer/CppMicroServices,CppMicroServices/CppMicroServices,CppMicroServices/CppMicroServices,CppMicroServices/CppMicroServices,saschazelzer/CppMicroServices,CppMicroServices/CppMicroServices