tools/psl.c: Fix build on Windows

localtime_r() is not available on Windows but a more-secure variant
of localtime(), localtime_s() is provided on Windows.

Define localtime_r() on Windows as its arguments are reversed as compared
to localetime_s(), to achive more or less the same purpose.

tools/psl.c

@@ -38,6 +38,10 @@
 
 #ifdef _WIN32
 # include <winsock2.h> // WSAStartup, WSACleanup
+
+// Windows does not have localtime_r but has localtime_s, which is more or less
+// the same except that the arguments are reversed
+# define localtime_r(t_sec,t_now) localtime_s(t_now,t_sec)
 #endif
 
 #include <stdlib.h>