Silence warnings from libnanomsg on Mac like we do on Linux.

Silence warnings from libnanomsg on Mac like we do on Linux.

This will silence these warnings:

../../third_party/externals/nanomsg/src/core/global.c:162:34: warning: missing field 'unused' initializer [-Wmissing-field-initializers]
static struct nn_global self = {0};

../../third_party/externals/nanomsg/src/utils/clock.c:44:61: warning: missing field 'denom' initializer [-Wmissing-field-initializers]
static mach_timebase_info_data_t nn_clock_timebase_info = {0};

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/c97570cfb38a90ad36b4dce1ca82e809d3fb9ef0

[mtklein, 2014-12-15 20:09:06]

mtklein@google.com changed reviewers:
+ caryclark@google.com, mtklein@google.com

[mtklein, 2014-12-15 20:09:09]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-12-15 20:09:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/803113003/1

[commit-bot: I haz the power, 2014-12-15 20:09:57]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2014-12-16 02:09 UTC

[caryclark, 2014-12-15 20:10:47]

lgtm

[commit-bot: I haz the power, 2014-12-15 20:24:50]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/c97570cfb38a90ad36b4dce1ca82e809d3fb9ef0