mksyscall.pl, types_linux.go: regenerate linux {386,amd64} files

Import syscall so that Kill can refer to syscall.Signal.  Drop
termios constants from types_linux.go--all other systems get
them from mkerrors.sh.

Fixes golang/go#8865.

LGTM=r
R=r
CC=golang-codereviews
https://golang.org/cl/152980044

unix/zsysnum_linux_386.go

@@ -342,4 +342,12 @@ const (
 	SYS_FANOTIFY_INIT          = 338
 	SYS_FANOTIFY_MARK          = 339
 	SYS_PRLIMIT64              = 340
+	SYS_NAME_TO_HANDLE_AT      = 341
+	SYS_OPEN_BY_HANDLE_AT      = 342
+	SYS_CLOCK_ADJTIME          = 343
+	SYS_SYNCFS                 = 344
+	SYS_SENDMMSG               = 345
+	SYS_SETNS                  = 346
+	SYS_PROCESS_VM_READV       = 347
+	SYS_PROCESS_VM_WRITEV      = 348
 )