unix: add ioctlPtr with unsafe.Pointer arg on other unices (cont)

CL 469315 missed a few conversions, this CL adds them. While
here, also update syscall wrapper generators.

For golang/go#44834

Change-Id: I4418a8c177ee6d1a269c1cc2c806b199dc7ccf0b
Reviewed-on: https://go-review.googlesource.com/c/sys/+/471119
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Dmitri Goutnik <dgoutnik@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>

unix/syscall_netbsd.go

@@ -13,7 +13,6 @@
 package unix
 
 import (
-	"runtime"
 	"syscall"
 	"unsafe"
 )
@@ -178,13 +177,13 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 }
 
 //sys	ioctl(fd int, req uint, arg uintptr) (err error)
+//sys	ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_IOCTL
 
 //sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL
 
 func IoctlGetPtmget(fd int, req uint) (*Ptmget, error) {
 	var value Ptmget
-	err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
-	runtime.KeepAlive(value)
+	err := ioctlPtr(fd, req, unsafe.Pointer(&value))
 	return &value, err
 }