clib2 Code

- Fixed to built properly.

- We now check if the file refers to a pipe before we make assumptions.

- Modified select() to support plain files, too. The new code now
compares the current file position against the current file size,
if that file is on a file system, or simply checks if there is
any data in the file (which works for the default PIPE: device).

- The raw file descriptor structure member fd_Position is now
always updated, regardless of whether the file supports random
access or not.

- The wildcard escape character used in __wildcard_expand_init() was
wrong. It should have been "'" but it was "`". Fixed.

- In __time_delay() the CheckIO() test was wrong and should have
tested for a request still in progress. Fixed.

- Getting ready for a new release...

- <sys/types.h> now also includes <time.h> and <stddef.h>.

- The socket/usergroup API function and data type definitions that used to
be defined in <unistd.h> have been moved into a separate header file
<sys/clib2_net.h> which, for backwards compatibility, can be include
from within <unistd.h> if the preprocessor symbol __USE_CLIB2_NETLIB
is defined early on. Eventually, <sys/clib2_net.h> should be removed
from the general header files and become a local library build header
file altogether. Note that in this case you would have to build your
own software using common TCP/IP SDK header files.

- The thread-safe version of isatty() should now work for stdio
file descriptors, too.

- Retrofitted thread-safety into the termios code.

- Added some documentation on the skeleton library code.

- Added a complete shared library skeleton example to demonstrate how the
clib2 shared library initialization/cleanup functions should be used.
This is a dual-build library which will both work with the plain 68k
AmigaOS and the PowerPC native AmigaOS4. The example source code can be
found in the "skeleton_library" subdirectory.