[Minor] Core: Oops, fix long standing misprint (yeild -> yield)

config.h.in

@@ -80,7 +80,7 @@
 #cmakedefine HAVE_SA_SIGINFO     1
 #cmakedefine HAVE_SANE_SHMEM     1
 #cmakedefine HAVE_SANE_TZSET     1
-#cmakedefine HAVE_SCHED_YEILD    1
+#cmakedefine HAVE_SCHED_YIELD    1
 #cmakedefine HAVE_SC_NPROCESSORS_ONLN 1
 #cmakedefine HAVE_SEARCH_H       1
 #cmakedefine HAVE_SENDFILE       1

src/libutil/mem_pool.c

@@ -853,7 +853,7 @@ __mutex_spin (rspamd_mempool_mutex_t * mutex)
 	/* Spin */
 	while (nanosleep (&ts, &ts) == -1 && errno == EINTR) ;
 #else
-#       error No methods to spin are defined
+#error No methods to spin are defined
 #endif
 	return 1;
 }