[NaCl SDK] Add include of stdint.h to netdb.h

[NaCl SDK] Add include of stdint.h to netdb.h

uint32_t is used in the declaration of getnetbyaddr but
stdin.h was not directly included.

This will be needed once this change the newlib headers
lands: https://codereview.chromium.org/1163893003

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4198

Committed: https://crrev.com/8ee7ead35e43c801531285603c1f4383249c6f37
Cr-Commit-Position: refs/heads/master@{#333601}

[Sam Clegg, 2015-06-08 17:42:45]

sbc@chromium.org changed reviewers:
+ binji@chromium.org

[Sam Clegg, 2015-06-08 17:43:49]

The CQ bit was checked by sbc@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-08 17:45:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167113002/20001

[commit-bot: I haz the power, 2015-06-08 18:19:33]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-08 18:19:34]

Dry run: This issue passed the CQ dry run.

[binji, 2015-06-09 21:13:10]

lgtm

[Sam Clegg, 2015-06-09 21:41:09]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-06-09 21:42:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167113002/20001

[commit-bot: I haz the power, 2015-06-09 22:50:18]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-09 22:51:58]

Patchset 2 (id:??) landed as
https://crrev.com/8ee7ead35e43c801531285603c1f4383249c6f37
Cr-Commit-Position: refs/heads/master@{#333601}