Function to print call trace of a process.

Borrowed from this fm:
https://www.gnu.org/software/libc/manual/html_node/Backtraces.html

backtrace() and backtrace_symbols() are not implemented in alpine,
so we use __GLIBC__ ifdef to do not compile this function there.

v4: New
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>