backtrace is glibc only feature on linux so check for glibc before using
it
Clangs clear_cache has different signature than gcc provided builtin
make it compatible for both
(From OE-Core rev: c3dc346d44c8c5485b3eb1a97f32ba2ed2e76ece)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Khem Raj