Sync our copy of the timezone library with IANA release tzcode2017c.

This is a trivial update containing only cosmetic changes.  The point
is just to get back to being synced with an official release of tzcode,
rather than some ad-hoc point in their commit history, which is where
commit 47f849a3 left it.

src/timezone/README

@@ -50,7 +50,7 @@ match properly on the old version.
 Time Zone code
 ==============
 
-The code in this directory is currently synced with tzcode release 2017b.
+The code in this directory is currently synced with tzcode release 2017c.
 There are many cosmetic (and not so cosmetic) differences from the
 original tzcode library, but diffs in the upstream version should usually
 be propagated to our version.  Here are some notes about that.

src/timezone/localtime.c

@@ -802,8 +802,8 @@ transtime(int year, const struct rule *rulep,
 {
 	bool		leapyear;
 	int32		value;
-	int			i,
-				d,
+	int			i;
+	int			d,
 				m1,
 				yy0,
 				yy1,

src/timezone/strftime.c

@@ -119,8 +119,7 @@ static char *_yconv(int, int, bool, bool, char *, const char *);
 
 
 size_t
-pg_strftime(char *s, size_t maxsize, const char *format,
-			const struct pg_tm *t)
+pg_strftime(char *s, size_t maxsize, const char *format, const struct pg_tm *t)
 {
 	char	   *p;
 	enum warn	warn = IN_NONE;
@@ -228,9 +227,9 @@ _fmt(const char *format, const struct pg_tm *t, char *pt,
 				case 'k':
 
 					/*
-					 * This used to be...  _conv(t->tm_hour % 12 ? t->tm_hour
-					 * % 12 : 12, 2, ' '); ...and has been changed to the
-					 * below to match SunOS 4.1.1 and Arnold Robbins' strftime
+					 * This used to be... _conv(t->tm_hour % 12 ? t->tm_hour %
+					 * 12 : 12, 2, ' '); ...and has been changed to the below
+					 * to match SunOS 4.1.1 and Arnold Robbins' strftime
 					 * version 3.0. That is, "%k" and "%l" have been swapped.
 					 * (ado, 1993-05-24)
 					 */
@@ -312,7 +311,7 @@ _fmt(const char *format, const struct pg_tm *t, char *pt,
  * (01-53)."
  * (ado, 1993-05-24)
  *
- * From <http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html> by Markus Kuhn:
+ * From <https://www.cl.cam.ac.uk/~mgk25/iso-time.html> by Markus Kuhn:
  * "Week 01 of a year is per definition the first week which has the
  * Thursday in this year, which is equivalent to the week which contains
  * the fourth day of January. In other words, the first week of a new year

src/timezone/zic.c

@@ -984,7 +984,7 @@ static zic_t const max_time = MAXVAL(zic_t, TIME_T_BITS_IN_FILE);
  * Ade PAR, Aghanim N, Armitage-Caplan C et al.  Planck 2013 results.
  * I. Overview of products and scientific results.
  * arXiv:1303.5062 2013-03-20 20:10:01 UTC
- * <http://arxiv.org/pdf/1303.5062v1> [PDF]
+ * <https://arxiv.org/pdf/1303.5062v1> [PDF]
  *
  * Page 36, Table 9, row Age/Gyr, column Planck+WP+highL+BAO 68% limits
  * gives the value 13.798 plus-or-minus 0.037 billion years.
@@ -1208,7 +1208,9 @@ infile(const char *name)
 			/* nothing to do */
 		}
 		else if (wantcont)
+		{
 			wantcont = inzcont(fields, nfields);
+		}
 		else
 		{
 			struct lookup const *line_codes