Define the constants needed to allow the os.tempnam(), os.tmpfile(), and
os.tmpnam() functions to be made available.

This is part of SF patch #435492.
diff --git a/PC/config.h b/PC/config.h
index 7e54a9d..d0a8907 100644
--- a/PC/config.h
+++ b/PC/config.h
@@ -38,6 +38,9 @@
 #define HAVE_LIMITS_H
 #define HAVE_SYS_UTIME_H
 #define HAVE_HYPOT
+#define HAVE_TEMPNAM
+#define HAVE_TMPFILE
+#define HAVE_TMPNAM
 #define DONT_HAVE_SIG_ALARM
 #define DONT_HAVE_SIG_PAUSE
 #define LONG_BIT	32