Fix 32-bit compilation

[tyilo]

Without this node-gyp produces the following error when compiling:

C:\wmi-native-module-main\src\wmi_wrapper.cpp(102,27): error C2220: the following warning is treated as an error [C:\wmi-native-module-main\build\wmi_native_module.vcxproj]
C:\wmi-native-module-main\src\wmi_wrapper.cpp(102,27): warning C4018: '<': signed/unsigned mismatch [C:\wmi-native-module-main\build\wmi_native_module.vcxproj]
C:\wmi-native-module-main\src\wmi_wrapper.cpp(365,27): warning C4018: '<': signed/unsigned mismatch [C:\wmi-native-module-main\build\wmi_native_module.vcxproj]
C:\wmi-native-module-main\src\wmi_wrapper.cpp(368,31): warning C4018: '<': signed/unsigned mismatch [C:\wmi-native-module-main\build\wmi_native_module.vcxproj]

[tyilo]

@esnyder1 Would it be possible to create a release containing this fix?

[esnyder1]

@tyilo We are working on getting a release out this month