added additional dllookup suppressions for test6

tests/sigaltstack.suppression

@@ -74,3 +74,75 @@
    fun:dlerror_run
    fun:__libc_dlopen_mode
 }
+{
+   mysterious_dl_leak_1a
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   fun:malloc
+   fun:strdup
+   fun:_dl_load_cache_lookup
+   fun:_dl_map_object
+   fun:dl_open_worker_begin
+   fun:_dl_catch_exception
+   fun:dl_open_worker
+   fun:_dl_catch_exception
+   fun:_dl_open
+   fun:do_dlopen
+   fun:_dl_catch_exception
+   fun:_dl_catch_error
+}
+{
+   mysterious_dl_leak_2a
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   fun:UnknownInlinedFun
+   fun:_dl_new_object
+   fun:_dl_map_object_from_fd
+   fun:_dl_map_object
+   fun:dl_open_worker_begin
+   fun:_dl_catch_exception
+   fun:dl_open_worker
+   fun:_dl_catch_exception
+   fun:_dl_open
+   fun:do_dlopen
+   fun:_dl_catch_exception
+   fun:_dl_catch_error
+}
+{
+   mysterious_dl_leak_3a
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:calloc
+   fun:UnknownInlinedFun
+   fun:_dl_check_map_versions
+   fun:dl_open_worker_begin
+   fun:_dl_catch_exception
+   fun:dl_open_worker
+   fun:_dl_catch_exception
+   fun:_dl_open
+   fun:do_dlopen
+   fun:_dl_catch_exception
+   fun:_dl_catch_error
+   fun:dlerror_run
+   fun:__libc_dlopen_mode
+}
+{
+   mysterious_dl_leak_4a
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:calloc
+   fun:UnknownInlinedFun
+   fun:_dl_new_object
+   fun:_dl_map_object_from_fd
+   fun:_dl_map_object
+   fun:dl_open_worker_begin
+   fun:_dl_catch_exception
+   fun:dl_open_worker
+   fun:_dl_catch_exception
+   fun:_dl_open
+   fun:do_dlopen
+   fun:_dl_catch_exception
+   fun:_dl_catch_error
+}