update to 2020c

lib/libc/time/Makefile

@@ -1022,10 +1022,14 @@ tzdata$(VERSION)-rearguard.tar.gz: rearguard.zi set-timestamps.out
 		done
 		sed '1s/$$/-rearguard/' \
 		  <version >tzdata$(VERSION)-rearguard.dir/version
+		: The dummy pacificnew pacifies TZUpdater 2.3.1 and earlier.
+		touch -md 2020-10-12T22:53:00Z \
+		  tzdata$(VERSION)-rearguard.dir/pacificnew
 		touch -cmr version tzdata$(VERSION)-rearguard.dir/version
 		LC_ALL=C && export LC_ALL && \
 		  (cd tzdata$(VERSION)-rearguard.dir && \
-		   tar $(TARFLAGS) -cf - $(COMMON) $(DATA) $(MISC) | \
+		   tar $(TARFLAGS) -cf - \
+			$(COMMON) $(DATA) $(MISC) pacificnew | \
 		     gzip $(GZIPFLAGS)) >$@.out
 		mv $@.out $@
 

lib/libc/time/NEWS

@@ -1,5 +1,25 @@
 News for the tz database
 
+Release 2020c - 2020-10-16 11:15:53 -0700
+
+  Briefly:
+    Fiji starts DST later than usual, on 2020-12-20.
+
+  Changes to future timestamps
+
+    Fiji will start DST on 2020-12-20, instead of 2020-11-08 as
+    previously predicted.  DST will still end on 2021-01-17.
+    (Thanks to Raymond Kumar and Alan Mintz.)  Assume for now that
+    the later-than-usual start date is a one-time departure from the
+    recent pattern.
+
+  Changes to build procedure
+
+    Rearguard tarballs now contain an empty file pacificnew.
+    Some older downstream software expects this file to exist.
+    (Problem reported by Mike Cullinan.)
+
+
 Release 2020b - 2020-10-06 18:35:04 -0700
 
   Briefly:

lib/libc/time/version

@@ -1 +1 @@
-2020b
+2020c