ssa_signal_handler.c: Add parsing backtrace line

Currently if backtrace contains a shared library routine,
addr2line utility is not able to translate address
into human readable format.

In such cases, backtrace line will be parsed and if
an absolute address appears, such as:

	/lib64/libpthread.so.0(+0x687)

and not:

	/lib64/libpthread.so.0(pthread_create+0x687)

it will be translated into a human readable format.

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>