unix: fix uri for openbsd's syscall numbers

Change-Id: Ibc189f7e27ccdde94fd7da25a155636ee6bd6b25
Reviewed-on: https://go-review.googlesource.com/1920
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

unix/mkall.sh

@@ -193,7 +193,7 @@ openbsd_386)
 	mksyscall="./mksyscall.pl -l32 -openbsd"
 	mksysctl="./mksysctl_openbsd.pl"
 	zsysctl="zsysctl_openbsd.go"
-	mksysnum="curl -s 'http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
+	mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 openbsd_amd64)
@@ -201,7 +201,7 @@ openbsd_amd64)
 	mksyscall="./mksyscall.pl -openbsd"
 	mksysctl="./mksysctl_openbsd.pl"
 	zsysctl="zsysctl_openbsd.go"
-	mksysnum="curl -s 'http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
+	mksysnum="curl -s 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master' | ./mksysnum_openbsd.pl"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 solaris_amd64)