[MIPS] Switch to newer versions of the tools

[MIPS] Switch to newer versions of the tools

Update:

- gcc to 4.9.0
- binutils to 2.24
- eglibc to 2.19
- gdb to 7.7.1
- kernel headers to 3.14.2

NOTRY=true
However, I have run a try job manually, and it passed fine, but CQ has
some issues, and this is a workaround for it.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=2275
TEST= mips toolchain buildbot

Committed: http://src.chromium.org/viewvc/native_client?view=rev&revision=13173

[petarj, 2014-05-14 17:03:43]

PTAL.

[bradn, 2014-05-14 17:26:37]

lgtm

[petarj, 2014-05-14 17:27:44]

The CQ bit was checked by petarj@mips.com

[commit-bot: I haz the power, 2014-05-14 17:27:56]

CQ is trying da patch. Follow status at
 https://nativeclient-status.appspot.com/cq/petarj@mips.com/281953004/1

[commit-bot: I haz the power, 2014-05-14 17:29:08]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  nacl-precise64_validator_opt on tryserver.nacl
(http://build.chromium.org/p/tryserver.nacl/builders/nacl-precise64_validator_...)
  nacl-precise_64-newlib-mips-pnacl on tryserver.nacl
(http://build.chromium.org/p/tryserver.nacl/builders/nacl-precise_64-newlib-mi...)

[commit-bot: I haz the power, 2014-05-14 17:29:58]

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

[commit-bot: I haz the power, 2014-05-14 17:29:58]

Try jobs failed on following builders:
  nacl-precise64_validator_opt on tryserver.nacl
(http://build.chromium.org/p/tryserver.nacl/builders/nacl-precise64_validator_...)
  nacl-precise_64-newlib-mips-pnacl on tryserver.nacl
(http://build.chromium.org/p/tryserver.nacl/builders/nacl-precise_64-newlib-mi...)

[petarj, 2014-05-14 17:31:05]

The CQ bit was checked by petarj@mips.com

[commit-bot: I haz the power, 2014-05-14 17:31:18]

CQ is trying da patch. Follow status at
 https://nativeclient-status.appspot.com/cq/petarj@mips.com/281953004/1

[commit-bot: I haz the power, 2014-05-14 17:31:23]

Change committed as 13173