Android: fix link error for android_full_debug=1

Android: fix link error for android_full_debug=1
Currently android_full_debug=1
fails to link with:
"undefined reference to __cxa_bad_typeid".
Work around this by telling the linker to ignore unused input sections.

[bulach, 2013-03-20 11:49:30]

+digit, our compiler expert

nit: the patch title should normally be a sentence, and if it has a well-defined
scope, it's better to prefix it (so that sheriffs would know if this could
possibly break other platforms, and so on...).

So I'd suggest something like:

Android: fix link error for android_full_debug=1

[digit1, 2013-03-20 13:57:51]

lgtm. For the record, the main issue has been fixed in the AOSP ndk sources, and
the fix will appear in the next official release (no ETA for now). See
https://android-review.googlesource.com/#/c/46534/ (but note that these files
were touched by other patches later).

I'm reluctant to manually update the content of third_party/android_tools/ndk/
with a new version of these sources until the official NDK is released, so until
this happens, this patch should be enough.

*Please* change the description appropriately before submitting this (use the
git format: one line description + one empty line + more descriptive text).

Thanks a lot.

[mostynb%opera.com, 2013-03-21 00:05:56]

On 2013/03/20 13:57:51, digit1 wrote:
> *Please* change the description appropriately before submitting this (use the
> git format: one line description + one empty line + more descriptive text).

Is the current description sufficient?  The empty line is not visible here, but
it is when I edit this issue.

[mostynb%opera.com, 2013-04-08 11:49:45]

Resubmitted here (due to account changes):
https://codereview.chromium.org/13772007/