Revert 262344 "don't use glibc-specific execinfo.h on uclibc builds"

Broken in libc++ builds.
BUG=361130

> don't use glibc-specific execinfo.h on uclibc builds
> 
> The execinfo.h header is glibc-specific, as is the backtrace function.
> Let's skip them for uclibc builds.
> 
> Review URL: https://codereview.chromium.org/226623008

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Review URL: https://codereview.chromium.org/224753005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@262401 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed