Include <stdint.h> in libc/inconv

[arichardson]

Summary

When crossbuilding FreeBSD on a Mac we need to bootstrap mkesdb_static and
that includes this file. On MacOS sys/types.h doesn't define uint8_t so we
need stdint.h as well.

[emaste]

Does stdint.h define all of the types needed here (i.e., is sys/types.h now redundant)?

[arichardson]

I didn't check that but I would assume that size_t is also defined after including stdint.h. I can try compiling without sys/types.h later and check if it works.

[arichardson]

No longer needed