syscall: mkerrors.sh: don't define _FILE_OFFSET_BITS if __LP64__

If __LP64__ is defined then the type "long" is 64-bits, and there is
no need to explicitly request _FILE_OFFSET_BITS == 64.  This changes
the definitions of F_GETLK, F_SETLK, and F_SETLKW on PPC to the values
that the kernel requires.  The values used in C when _FILE_OFFSET_BITS
== 64 are corrected by the glibc fcntl function before making the
system call.

With this change, regenerate ppc64le files on Ubuntu trusty.

Change-Id: I8dddbd8a6bae877efff818f5c5dd06291ade3238
Reviewed-on: https://go-review.googlesource.com/9962
Reviewed-by: Minux Ma <minux@golang.org>

src/syscall/mkerrors.sh

@@ -87,7 +87,9 @@ includes_FreeBSD='
 includes_Linux='
 #define _LARGEFILE_SOURCE
 #define _LARGEFILE64_SOURCE
+#ifndef __LP64__
 #define _FILE_OFFSET_BITS 64
+#endif
 #define _GNU_SOURCE
 
 #include <bits/sockaddr.h>

src/syscall/zerrors_linux_ppc64le.go

@@ -366,9 +366,9 @@ const (
 	F_SETFD                          = 0x2
 	F_SETFL                          = 0x4
 	F_SETLEASE                       = 0x400
-	F_SETLK                          = 0xd
+	F_SETLK                          = 0x6
 	F_SETLK64                        = 0xd
-	F_SETLKW                         = 0xe
+	F_SETLKW                         = 0x7
 	F_SETLKW64                       = 0xe
 	F_SETOWN                         = 0x8
 	F_SETOWN_EX                      = 0xf

src/syscall/ztypes_linux_ppc64le.go

@@ -549,7 +549,7 @@ type Sysinfo_t struct {
 	Totalhigh uint64
 	Freehigh  uint64
 	Unit      uint32
-	X_f       [0]byte
+	X_f       [0]uint8
 	Pad_cgo_1 [4]byte
 }