* addr2line.c (follow_debuglink): insert global_debug_dir by using
  memmove instead of copying to temporary buffer.

* dln.c (dln_load): use memcpy with the known length instead of
  strcpy.

* gc.c (rb_gc_unprotect_logging): use strdup instead of malloc and
  strcpy.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e