Fix some word repetitions

* Makefile, europe, localtime.c, tz-art.htm, tzfile.5:
Fix repeated instances of words in commentary.
(Problem with 'Makefile'reported by Curtis Manwaring.)

Makefile

@@ -75,7 +75,7 @@ LIBDIR=		$(TOPDIR)/lib
 # If you want only POSIX time, with time values interpreted as
 # seconds since the epoch (not counting leap seconds), use
 #	REDO=		posix_only
-# below.  If you want want only "right" time, with values interpreted
+# below.  If you want only "right" time, with values interpreted
 # as seconds since the epoch (counting leap seconds), use
 #	REDO=		right_only
 # below.  If you want both sets of data available, with leap seconds not

europe

@@ -1524,7 +1524,7 @@ Zone Atlantic/Reykjavik	-1:28	-	LMT	1908
 # From Paul Eggert (2016-10-27):
 # Go with INRiM for DST rules, except as corrected by Inglis for 1944
 # for the Kingdom of Italy.  This is consistent with Renzo Baldini.
-# Model Rome's occupation by using using C-Eur rules from 1943-09-10
+# Model Rome's occupation by using C-Eur rules from 1943-09-10
 # to 1944-06-04; although Rome was an open city during this period, it
 # was effectively controlled by Germany.
 #

localtime.c

@@ -639,7 +639,7 @@ tzloadbody(char const *name, struct state *sp, bool doextend,
 		}
 	}
 	/*
-	** If type 0 is is unused in transitions,
+	** If type 0 is unused in transitions,
 	** it's the type to use for early times.
 	*/
 	for (i = 0; i < sp->timecnt; ++i)

tz-art.htm

@@ -24,7 +24,7 @@ into problems that programmers have with timekeeping.</li>
 Explaining The Mysteries Of Time Zones</a>" (2017; 2:15)
 briefly says why France has more time zones than Russia.</a>
 <li>
-"About Time" (1962; 53 minutes) is part of the the
+"About Time" (1962; 53 minutes) is part of the
 Bell Science extravaganza, with Frank Baxter, Richard Deacon, and Les Tremayne.
 Its advisor was Richard Feynman, and it was voiced by Mel Blanc.
 (<a href="http://www.imdb.com/title/tt0154110/">IMDb entry</a>.)</li>

tzfile.5

@@ -145,7 +145,7 @@ POSIX-TZ-environment-variable-style string for use in handling instants
 after the last transition time stored in the file
 (with nothing between the newlines if there is no POSIX representation for
 such instants).
-The POSIX-style string must must agree with the local time type after
+The POSIX-style string must agree with the local time type after
 both data's last transition times; for example, given the string
 .q "WET0WEST,M3.5.0,M10.5.0/3"
 then if a last transition time is in July, the transition's local time