GN (Android): Make is_clang work for (at least for arm32)

GN (Android): Make is_clang work for (at least for arm32)

There seem to be more compiler flags to tweak for other target
architectures, but with this I could at least build & run chrome_apk
with is_clang=true

BUG=402625
Committed: https://crrev.com/91d9b7ee4e51168ef413265e33b8fe25253a1758
Cr-Commit-Position: refs/heads/master@{#342227}

[agrieve, 2015-07-31 20:31:22]

agrieve@chromium.org changed reviewers:
+ brettw@chromium.org, cjhopman@chromium.org

[brettw, 2015-07-31 23:27:44]

lgtm

[cjhopman, 2015-08-04 23:10:39]

lgtm

[agrieve, 2015-08-06 19:58:29]

The CQ bit was checked by agrieve@chromium.org

[agrieve, 2015-08-06 19:58:29]

The patchset sent to the CQ was uploaded after l-g-t-m from
cjhopman@chromium.org, brettw@chromium.org
Link to the patchset: https://codereview.chromium.org/1258923012/#ps20001
(title: "fix nacl build errors")

[commit-bot: I haz the power, 2015-08-06 19:59:14]

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

[commit-bot: I haz the power, 2015-08-06 19:59:14]

This CL has an open dependency (Issue 1278793003 Patch 1). Please resolve the
dependency and try again.

[agrieve, 2015-08-06 21:44:34]

The CQ bit was checked by agrieve@chromium.org

[commit-bot: I haz the power, 2015-08-06 21:45:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1258923012/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1258923012/20001

[commit-bot: I haz the power, 2015-08-06 23:18:55]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-06 23:19:40]

Patchset 2 (id:??) landed as
https://crrev.com/91d9b7ee4e51168ef413265e33b8fe25253a1758
Cr-Commit-Position: refs/heads/master@{#342227}