[NaCl SDK] Fix sys/time.h and utime.h headers

[NaCl SDK] Fix sys/time.h and utime.h headers

include_next must be outside the include guard!

When naclports builds a package, it copies the headers from
$NACL_SDK_ROOT/include/$toolchain directly into the toolchain include
directories (i.e. toolchain/linux_x86_newlib/x86_64-nacl/usr/include).

This means that the same header is included twice in the header seach path,
e.g.:
$NACL_SDK_ROOT/include/newlib/foo.h
$NACL_SDK_ROOT/toolchain/linux_x86_newlib/x86_64-nacl/usr/include/foo.h

If include_next is inside the include guard, then the full include chain for
that header name will not be followed (it will stop when it hits the same
include guard).

BUG=none
R=bradnelson@google.com, sbc@chromium.org, bradnelson@chromium.org

Committed: https://crrev.com/2b6e7b2f800fb5ec9755492d208175c95d8531c7
Cr-Commit-Position: refs/heads/master@{#295164}

[bradn, 2014-09-16 21:54:00]

bradnelson@google.com changed reviewers:
+ bradnelson@google.com

[bradn, 2014-09-16 21:54:01]

lgtm

[Sam Clegg, 2014-09-16 21:57:06]

lgtm.

Sorry about not flagging this in the initial review.

[binji, 2014-09-16 22:44:23]

Committed patchset #1 (id:1) manually as 2b6e7b2 (presubmit successful).

[commit-bot: I haz the power, 2014-09-16 22:44:23]

Patchset 1 (id:??) landed as
https://crrev.com/2b6e7b2f800fb5ec9755492d208175c95d8531c7
Cr-Commit-Position: refs/heads/master@{#295164}