Don't fail the build due to clang integer constant range warnings

This warning checks whether a constant is out of range of the integer
type. An example is comparison of 'u_int' > 4294967295 is always false
and in this case the warning makes sense.
However, when the type is a typedef that can be either 64 or 32 bits the
if condition is only tautological in some configurations so this should
not be a warning that fails the build.

Reviewed by: dim
Approved by: jhb (mentor)
Differential Revision: https://reviews.freebsd.org/D12912