NonSFI mode: Add libcrt_platform for native/mixed linking.

NonSFI mode: Add libcrt_platform for native/mixed linking.

For ARM link failure happens trying to link exception_test.o because
of missing __aeabi_read_tp symbol, this solves the problem.

$ ./scons -j20 --mode=dbg-host,nacl_irt_test bitcode=1 nonsfi_nacl=1 \
  pnacl_generate_pexe=0 run_exception_test_irt \
  use_newlib_nonsfi_loader=0 platform=arm

BUG= https://code.google.com/p/chromium/issues/detail?id=408879
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3951

Committed: http://src.chromium.org/viewvc/native_client?view=rev&revision=13752

[Junichi Uekawa, 2014-09-17 03:46:30]

uekawa@chromium.org changed reviewers:
+ dschuff@chromium.org, hamaji@chromium.org, hidehiko@chromium.org,
mseaborn@chromium.org

[Junichi Uekawa, 2014-09-17 03:46:31]

Hi Derek, I saw you touched here recently.

Mark suggested doing this to get exception_test linking:
scons-out/nacl_irt_test-arm-pnacl-nonsfi-clang/obj/tests/exception_test/exception_test.o:
> error: undefined reference to '__aeabi_read_tp'
in https://codereview.chromium.org/544003002/

Let me know what you think

[Mark Seaborn, 2014-09-17 20:34:22]

LGTM

[Derek Schuff, 2014-09-18 04:45:14]

lgtm

[Junichi Uekawa, 2014-09-18 05:00:31]

The CQ bit was checked by uekawa@chromium.org

[commit-bot: I haz the power, 2014-09-18 05:00:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/581463004/1

[commit-bot: I haz the power, 2014-09-18 18:43:09]

Committed patchset #1 (id:1) as 13752