addl + andl $0xff, improving speed on PPro by another 15%.

Rev: src/nettle/x86/arcfour-crypt.asm:1.8

incl + andl, to improve speed on PPro and PII. Suggested by
Fredrik Olsson.

Rev: src/nettle/x86/arcfour-crypt.asm:1.7

Rev: src/nettle/x86/arcfour-crypt.asm:1.6

the S array swap was forgotten.
* arcfour.c (arcfour_stream): Likewise.
* arcfour-crypt.c (arcfour_crypt): Likewise.

Rev: src/nettle/ChangeLog:1.233
Rev: src/nettle/arcfour-crypt.c:1.2
Rev: src/nettle/arcfour.c:1.6
Rev: src/nettle/x86/arcfour-crypt.asm:1.5

i, j at the end of the loop.

Rev: src/nettle/x86/arcfour-crypt.asm:1.4

Rev: src/nettle/x86/arcfour-crypt.asm:1.3

Fixed debug information.

Rev: src/nettle/x86/arcfour-crypt.asm:1.2

the optimized C code.

Rev: src/nettle/x86/arcfour-crypt.asm:1.1