<inttypes.h> directly. Updated all users of inttypes.h.

Rev: src/nettle/aes.h:1.7
Rev: src/nettle/aesdata.c:1.3
Rev: src/nettle/arcfour.h:1.5
Rev: src/nettle/base16.h:1.3
Rev: src/nettle/base64.h:1.14
Rev: src/nettle/bignum.h:1.8
Rev: src/nettle/blowfish.h:1.9
Rev: src/nettle/cast128.h:1.5
Rev: src/nettle/cbc.h:1.5
Rev: src/nettle/des.h:1.9
Rev: src/nettle/dsa.h:1.9
Rev: src/nettle/knuth-lfib.h:1.3
Rev: src/nettle/md2.h:1.3
Rev: src/nettle/md4.h:1.3
Rev: src/nettle/md5.h:1.7
Rev: src/nettle/memxor.h:1.3
Rev: src/nettle/nettle-meta.h:1.11
Rev: src/nettle/pkcs1.h:1.3
Rev: src/nettle/realloc.h:1.2
Rev: src/nettle/rsa.h:1.24
Rev: src/nettle/serpent.h:1.7
Rev: src/nettle/sexp.h:1.16
Rev: src/nettle/sha.h:1.4
Rev: src/nettle/twofish.h:1.6