PR modula2/115276: libgm2 wraptime.cc field access all return -1.

PR modula2/115276: libgm2 wraptime.cc field access all return -1.

This patch provides autoconf tests for each field used in wraptime.cc
referencing struct tm and struct timeval.

libgm2/ChangeLog:

	PR modula2/115276
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac (AC_STRUCT_TIMEZONE): Add.
	(AC_CHECK_MEMBER): Test for struct tm.tm_year.
	(AC_CHECK_MEMBER): Test for struct tm.tm_mon.
	(AC_CHECK_MEMBER): Test for struct tm.tm_mday.
	(AC_CHECK_MEMBER): Test for struct tm.tm_hour.
	(AC_CHECK_MEMBER): Test for struct tm.tm_min.
	(AC_CHECK_MEMBER): Test for struct tm.tm_sec.
	(AC_CHECK_MEMBER): Test for struct tm.tm_year.
	(AC_CHECK_MEMBER): Test for struct tm.tm_yday.
	(AC_CHECK_MEMBER): Test for struct tm.tm_wday.
	(AC_CHECK_MEMBER): Test for struct tm.tm_isdst.
	(AC_CHECK_MEMBER): Test for struct timeval.tv_sec.
	(AC_CHECK_MEMBER): Test for struct timeval.tv_sec.
	(AC_CHECK_MEMBER): Test for struct timeval.tv_usec.
	* libm2iso/wraptime.cc (InitTimeval): Guard against lack
	struct timeval and malloc.
	(InitTimezone): Guard against lack of struct tm.tm_zone
	and malloc.
	(KillTimezone): Ditto.
	(InitTimeval): Guard against lack of struct timeval
	and malloc.
	(KillTimeval): Guard against lack of malloc.
	(settimeofday): Guard against lack of struct tm.tm_zone.
	(GetFractions): Guard against lack of struct timeval.
	(localtime_r): Ditto.
	(GetYear): Guard against lack of struct tm.
	(GetMonth): Ditto.
	(GetDay): Ditto.
	(GetHour): Ditto.
	(GetMinute): Ditto.
	(GetSecond): Ditto.
	(GetSummerTime): Ditto.
	(GetDST): Guards against lack of struct timezone.
	(SetTimezone): Ditto.
	(SetTimeval): Guard against lack of struct tm.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>