Merge pull request lxc#1 from Jafaral/lxc_strerror

Fix: undefined symbol error when loading lxc.so

Author: Jafaral

ext/lxc/lxc.c

@@ -42,7 +42,6 @@ extern void *rb_thread_call_without_gvl(void *(*func)(void *), void *data1,
 
 extern int lxc_wait_for_pid_status(pid_t pid);
 extern long lxc_config_parse_arch(const char *arch);
-extern const char *lxc_strerror(int error);
 
 static VALUE Container;
 static VALUE Error;
@@ -2069,7 +2068,7 @@ container_unfreeze(VALUE self)
 
  ret = RELEASING_GVL(unfreeze_without_gvl, data);
  if (!ret)
- rb_raise(Error, "unable to unfreeze container: %s", lxc_strerror(ret));
+ rb_raise(Error, "unable to unfreeze container");
 
  return self;
 }