Snippets for sed 4.10 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/sed/4.10/1.fc45/data/logs/s390x/build.log.

lib/glthread/lock.h:526:38: warning: statement with no effect [-Wunused-value]
  526 | # define glthread_lock_destroy(NAME) 0
      |                                      ^

lib/glthread/lock.h:526:38: warning: statement with no effect [-Wunused-value]
  526 | # define glthread_lock_destroy(NAME) 0
      |                                      ^

lib/glthread/lock.h:526:38: warning: statement with no effect [-Wunused-value]
  526 | # define glthread_lock_destroy(NAME) 0
      |                                      ^

lib/glthread/lock.h:524:35: warning: statement with no effect [-Wunused-value]
  524 | # define glthread_lock_lock(NAME) 0
      |                                   ^

lib/glthread/lock.h:525:37: warning: statement with no effect [-Wunused-value]
  525 | # define glthread_lock_unlock(NAME) 0
      |                                     ^

lib/regexec.c:192:13: warning: unused variable 'dfa' [-Wunused-variable]
  192 |   re_dfa_t *dfa = preg->buffer;
      |             ^~~

lib/glthread/lock.h:524:35: warning: statement with no effect [-Wunused-value]
  524 | # define glthread_lock_lock(NAME) 0
      |                                   ^

lib/glthread/lock.h:525:37: warning: statement with no effect [-Wunused-value]
  525 | # define glthread_lock_unlock(NAME) 0
      |                                     ^

lib/regexec.c:372:13: warning: unused variable 'dfa' [-Wunused-variable]
  372 |   re_dfa_t *dfa = bufp->buffer;
      |             ^~~

sed/utils.c:422:1: warning: old-style function definition [-Wold-style-definition]
  422 | _copy (from, to)
      | ^~~~~

test-thread_create.c:30:20: warning: 'worker_thread' defined but not used [-Wunused-variable]
   30 | static gl_thread_t worker_thread;
      |                    ^~~~~~~~~~~~~