clib2 Code

- The functions in stdlib.h which require a compiler that supports the
"long long" data type are no longer prototyped if the library is built
for SAS/C.

- Folded duplicate code stdio_init_exit.c into a common function.

- Simplified the code in time_asctime_r.c which builds the time
string. It gracefully handles buffer sizes which are too short
by returning an empty string.

- Moved the tm->tm_wday initialization out of the hook function
in time_strftime.c since it was to be called only once anyway.

- Lost a few compiler warnings in unistd_time_delay.c and
time_gettimeofday.c.

- Folded duplicate code in time_mktime.c; also, errno is no longer
modified unless the library is built with the CHECK_FOR_NULL_POINTERS
option.

This commit was manufactured by cvs2svn to create tag 'V1_187'.

- Added the missing 'time_convert_time.c'.

- Changed the algorithm that calculates the number of days that have passed
so far as used by the the __convert_time() function and the conversion
code in strftime().

- Also changed the algorithm used by strftime() to produce the week numbers
(the '%U' and '%W' format specifiers). The new method is much simpler
than the old one.

- Made the code that converts a 'time_t' value into the 'struct DateStamp',
as used by strftime() and utime(), into its own function. This also
fixes a bug in the code strftime() would use which was completely
unaware of the local time zone settings.

- We also test the strftime() %U, %W and %j format specifiers.

- Plugged in a different algorithm for calculating the day of the week in
strftime() and asctime_r(). This one isn't sensitive to the effects of
adding/subtracting the local time zone.

- Added a missing file.

- Updated the .cvsignore file.

- The general test program now also exercises the time conversion functions.

- mktime() is supposed to convert the time specification, given as local
time, into the number of seconds since January 1st, 1970, relative to
UTC. This didn't really work up until now since the time value returned
was given as local time.