fix for invalid brace sequence expressions; cosmetic fix to help builtin; documentation and copyright updates; bump version to bash-5.3-rc1; cosmetic locale fixes

include/posixtime.h

@@ -90,4 +90,12 @@ getnow(void)
   } while (0)
 #endif
 
+#ifndef TIMESPEC_TO_TIMEVAL
+#  define TIMESPEC_TO_TIMEVAL(tv, ts) \
+  do { \
+    (tv)->tv_sec = (ts)->tv_sec; \
+    (tv)->tv_usec = (tv)->tv_nsec / 1000; \
+  } while (0)
+#endif
+
 #endif /* _POSIXTIME_H_ */