Update to pacify recent GCC's static checking.

These changes pacify gcc 4.8.2-19ubuntu1 on Ubuntu 14.04,
and take advantage of recently-added GCC options when compiling
with GCC_DEBUG_FLAGS.
* Makefile (GCC_DEBUG_FLAGS): Add -Wdeclaration-after-statement,
-Wjump-misses-init, -Wsuggest-attribute=format.
* date.c (copyright, sccsid):
* strftime.c (sccsid):
Remove unused vars.
* date.c (main):
* localtime.c (tzparse):
Remove no-longer-needed uses of INITIALIZE; GCC is smart enough to
figure these out on its own now.
* localtime.c (gmtsub): Redo initialization of gmt_is_set to pacify GCC.
Retry malloc next time even if it failed this time.
* private.h, zdump.c (GNUC_or_lint): Remove, as it provoked a GCC
diagnostic about unused macros in some cases.  Instead, just use
'lint'.  All uses removed.
(TZ_DOMAIN): Don't define unless needed, as otherwise it provokes
a GCC diagnostic about unused macros.
* private.h (INITIALIZE): Simplify accordingly.
* NEWS: Document this.

date.c

@@ -15,16 +15,6 @@
  * WARRANTIES OF MERCHANT[A]BILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-char copyright[] =
-"@(#) Copyright (c) 1985, 1987, 1988 The Regents of the University of California.\n\
- All rights reserved.\n";
-#endif /* not lint */
-
-#ifndef lint
-static char sccsid[] = "@(#)date.c	4.23 (Berkeley) 9/20/88";
-#endif /* not lint */
-
 #include "private.h"
 #if HAVE_ADJTIME || HAVE_SETTIMEOFDAY
 #include "sys/time.h"	/* for struct timeval, struct timezone */
@@ -99,10 +89,6 @@ main(const int argc, char *argv[])
 	char *			endarg;
 
 	INITIALIZE(dousg);
-	INITIALIZE(minuteswest);
-	INITIALIZE(dsttime);
-	INITIALIZE(adjust);
-	INITIALIZE(t);
 #ifdef LC_ALL
 	(void) setlocale(LC_ALL, "");
 #endif /* defined(LC_ALL) */