[NaCl SDK] Fix include_next of stdlib.h

[NaCl SDK] Fix include_next of stdlib.h

This change moves include_next outside of the include guard.

On PNaCl, including <stdlib.h> will include usr/include/stdlib.h. Naclports
copies this file to toolchain/linux_pnacl/usr/local/include/stdlib.h, which
will be included next. Since it uses the same include guard, the real stdlib.h
won't be included.

This change fixes the linux SDK builder:

    voronoi.cc:48:37: error: use of undeclared identifier 'rand_r'
      return static_cast<unsigned char>(rand_r(&g_rand_state) & 255);
                                        ^

BUG=none
R=sbc@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=273075

[Sam Clegg, 2014-05-27 23:12:05]

LGTM.

This is kinda of a mess. I hope we can improve on this later.

[binji, 2014-05-27 23:15:42]

On 2014/05/27 23:12:05, Sam Clegg wrote:
> LGTM.
> 
> This is kinda of a mess. I hope we can improve on this later.

Yes, as soon as I add realpath to the newlib headers (working on it now).

[Sam Clegg, 2014-05-27 23:22:41]

On 2014/05/27 23:15:42, binji wrote:
> On 2014/05/27 23:12:05, Sam Clegg wrote:
> > LGTM.
> > 
> > This is kinda of a mess. I hope we can improve on this later.
> 
> Yes, as soon as I add realpath to the newlib headers (working on it now).

The trybots don't run the test in question, so I'm happy for your dcommit this
directly top get the main builders green ASAP.

[binji, 2014-05-27 23:49:25]

On 2014/05/27 23:22:41, Sam Clegg wrote:
> On 2014/05/27 23:15:42, binji wrote:
> > On 2014/05/27 23:12:05, Sam Clegg wrote:
> > > LGTM.
> > > 
> > > This is kinda of a mess. I hope we can improve on this later.
> > 
> > Yes, as soon as I add realpath to the newlib headers (working on it now).
> 
> The trybots don't run the test in question, so I'm happy for your dcommit this
> directly top get the main builders green ASAP.

Good point.

[binji, 2014-05-27 23:51:24]

Committed patchset #1 manually as r273075 (presubmit successful).