clib2 Code

- Rewrote the code that allocates the file descriptor and file
buffer tables so that all the memory allocations are in one
place and it's possible to specify exactly how many table
entries are required at a time.

- Creation and initialization of semaphores now uses the AmigaOS4
specific functions for this purpose, if available.

- Added a very simple test program, just to see how much of the library
it will pull in when linked.

- Added uname command, as contributed by Peter Bengtsson. Thank you very much!

- Fixed the OS4 specific build makefile.

- Moved the signal semaphore allocation/initialization/deallocation
into a dedicated module. This also has the advantage that it's
harder to break code by accidentally forgetting to call
InitSemaphore() after having allocated the memory for it.

- Added the missing header files required to rebuild ftw_ftw.c and
ftw_nftw.c.

- Reworked the code that handles quoting for the wildcard expansion
routine. We no longer allocate memory and then modify it, but
call a function for each quoted parameter which does whatever is
necessary.

- The shell command parameter parser now considers the non-breaking
space character (ISO code 160) to be a blank space character, too.

- The lstat() code now reliably detects that it found a soft link.

- Fixed the compilation problems I had introduced by mistake.

- Added atoll(), ffs(), ftw(), nftw(), lstat() and uname() code
contributed by Peter Bengtsson. Thank you very much!