we now build with debug information on linux even for release builds. Debug
information is save in a separate .debug file that can be loaded by gdb.
switched to using the golangs's facilities for cgo backtraces. had to add
C++ demangling to it but its now on par with the default backtrace facility
that ceph had. This approach works with static builds and relies on the
symbol table alone -- no need for rdynamic or DWARF sections in the binary.
Update the build container so that all packages now build with debug, also
fixed zlib package which had a broken link.
Fixes#135
Bassam Tabbara
75523ccb17