Initialize POD members that were previously uninitialized

Initialize POD members that were previously uninitialized

* coveragedb.h: initialize type in coverage_element
* csclient.h: initialize argc in compile_server_client
* dwflpp.cxx: initialize blacklist_func, blacklist_func_ret,
              and blacklist_file in dwflpp
* dwflpp.h: initialize entrypc in func_info
* elaborate.cxx: initialize num_newly_resolved, num_still_unresolved,
                 assert_resolvability and t in typeresolution_info
* session.cxx: initialize automatic_server_mode in systemtap_session
* staptree.cxx: initialize privileged in probe, tok in component,
                and epilogue_style in probe_alias
* staptree.h: initialize num_index and expr_index in component
* tapset-utrace.cxx: initialize has_library in derived_probe
* tapsets.cxx: initialize has_process and has_library in
               dwarf_derived_probe, has_library in base_query,
               has_relative, relative_val, choose_next_line, and
               entrypc_for_next_line in dwarf_query, op in
               var_expanding_visitor and probe_type, probe_loc,
               probe_scn_offset, probe_scn_addr, arg_count, base,
               and semaphore in sdt_query
* translate.cxx: initialize action_counter and
                 probe_or_function_needs_deref_fault_handler in
                 c_unparser