Removes SYS_execve mention from syscall_execve_out
Correctly handles execve() x64 -> i386 transition
Fixes yet another typo in the syscalls table
Fixes i386 register sign-extension
struct Process now always has the 'mode' field
Fixes strarraydup() on x86_64 emulating i386

Pointer sizes are different.
Correctly handles execve() i386 -> x64 transition