clib2 Code

- Implemented atanh() and atanhf() which were not listed in the TODO
file but were still unimplemented up until now.

- Replaced ldexp() and modf().

- Corrected a typo.

- Updated math_hypot.c to a newer (e_hypot.c 1.3 95/01/18) version from
fdlibm which uses macros for manipulating the high and low words of a
double, like the rest of fdlibm functions in clib2. The previous version
would give bogus results when compiled with -O3 in clib2 which lead to
"interesting" results (and lots of fun while searching for the problem)
in Ghostscript. Wish I managed to track this down yesterday for 1.196
release... <aantonijevic>

- Removed <sys/clib2_net.h> and every reference to it.

- Removed the compiler log file generation.

- Removed a couple of compiler warnings; fishing for more...

- Updated the thread-safe library documentation section.

- Getting ready to make a new release.

- Resolved the vulnerability by caching the socket descriptor while the
stdio data is still locked.

- Removed the various workarounds associated with <unistd.h>, required
for building code that references the networking API. It is now possible,
provided you build your code with an existing TCP/IP API header file
set (such as from the "Roadshow" SDK) without running into data type
or function prototype declaration conflicts. I have added local versions
of <arpa/inet.h>, <netinet/in.h>, <netdb.h>, <sys/filio.h>, <sys/ioccom.h>,
<sys/ioctl.h>, <sys/select.h> and <sys/socket.h> and updated <unistd.h>,
<pwd.h> and <grp.h> accordingly. Note that some of the function prototypes
will conflict with the bsdsocket.library/usergroup.library API, which is
why you can disable the declarations through the __NO_NET_API preprocessor
symbol: if defined, none of the function prototypes will be defined.