Update syscall.master to 4.10-rc6. Also fix comments, a typo,
and wrong numbering for a few unimplemented syscalls.

For 32-bit Linuxulator, socketcall() syscall was historically
the entry point for the sockets API. Starting in Linux 4.3, direct
syscalls are provided for the sockets API. Enable it.

The initial version of patch was provided by trasz@ and extended by me.

Regen after r313284.

Fix r313284.

Members of the syscall argument structures are padded to a word size. So,
for COMPAT_LINUX32 we should convert user supplied system call arguments
which is 32-bit in that case to the array of register_t.

Finish r313684.

Convert linux_recv(), linux_send() and linux_accept() system call arguments
to the register_t type too.