Cleanup: Use Bit('build_ARCH') instead of Bit('target_ARCH')

Cleanup: Use Bit('build_ARCH') instead of Bit('target_ARCH')

Remove the definitions of 'target_ARCH' in SConstruct.

The distinction between "build" and "target" architecture is obsolete
-- the two are always the same.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=2703
TEST=trybots

Committed: http://src.chromium.org/viewvc/native_client?view=rev&revision=14161

[Mark Seaborn, 2014-12-01 17:01:21]

mseaborn@chromium.org changed reviewers:
+ mcgrathr@chromium.org

[Roland McGrath, 2014-12-02 18:47:45]

lgtm

[Mark Seaborn, 2014-12-02 18:49:48]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2014-12-02 18:50:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/758223003/20001

[commit-bot: I haz the power, 2014-12-02 18:51:11]

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

[commit-bot: I haz the power, 2014-12-02 18:51:12]

Presubmit check for 758223003-20001 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Missing LGTM from an OWNER for these files:
    src/trusted/validator_arm/build.scons

Presubmit checks took 2.5s to calculate.

Was the presubmit check useful? If not, run "git cl presubmit -v"
to figure out which PRESUBMIT.py was run, then run git blame
on the file to figure out who to ask for help.

[Mark Seaborn, 2014-12-02 18:59:38]

mseaborn@chromium.org changed reviewers:
+ jfb@chromium.org

[Mark Seaborn, 2014-12-02 19:00:20]

+JF: Can you do an OWNERS sign-off for validator_arm/?

[JF, 2014-12-02 19:16:23]

src/trusted/validator_arm/* lgtm

[Mark Seaborn, 2014-12-02 19:16:47]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2014-12-02 19:17:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/758223003/20001

[commit-bot: I haz the power, 2014-12-02 21:03:52]

Committed patchset #2 (id:20001) as
http://src.chromium.org/viewvc/native_client?view=rev&revision=14161