use zu instead of "lu and cast"

[divinity76]

No description provided.

[n1000]

Hi @divinity76 , would it be possible for you to modify this patch to use "SIZE_T_SPEC" as defined in tools/types.h instead of the %zu? Unfortunately the windows version of printf doesn't support %z

https://msdn.microsoft.com/en-us/library/tcxf1dw6.aspx

[n1000]

Here is an example from elsewhere in the code:

error (1, ENOTSUP, "%s not multiple of " SIZE_T_SPEC " bytes", file->name, sizeof (uint32_t));

Now that I am looking at our definition in types.h, i think we may have it not entirely correct for Windows, I can correct that issue in a separate patch.

[n1000]

Even though that page indicates that Visual Studio 2015 does not support %z, it does actually seem to be supported (just tested it). Either way, I think we should still use the SIZE_T_SPEC for now. Maybe we can get rid of it later.