Use a more precise check for '__lsan_ignore_object'

Use a more precise check for '__lsan_ignore_object'

* configure.ac: Add check for __lsan_ignore_object.

* src/buffer.c (enlarge_buffer_text):
* src/data.c (make_blv):
* src/emacs-module.c (Fmodule_load, initialize_environment):
* src/regex-emacs.c (regex_compile):
* src/search.c (newline_cache_on_off): Use new configuration macro.