clib2 Code

- Added shared library skeleton code (68k-only for now).

- Moved all the constructor code out of "stdlib_init_exit.c" and into the
files which initialize global data, such as the new "stdlib_program_name.c"
and "stdlib_malloc.c".

- Until I can find a way to invoke it from within the library, the
__machine_test() function is no longer invoked.

- Tagged global data with NOCOMMON attributes.

- Added the __lib_init() and __lib_exit() functions, which are part of the
thread-safe library and which can be used to hook up clib2 with standard
Amiga shared library/device code. Some documentation on how to use them
can be found in the <dos.h> header file.

Removed unneeded baserel stuff

Fixed a bug in getopt_long

*** empty log message ***

Added file system names

*** empty log message ***

output_buffer wasn't set correctly when the buffer was allocated

- Corrected a typo in the object build list (math_exp2f.c rather than
math_expf2.c).

- Dropped stdlib_wildcard_expand.c, which is no longer necessary.