clib2 Code

- 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.

- Repaired the pattern matching code which expands command line arguments:
it no longer requires that any parameters are quoted and it is automatically
enabled if you link against libunix.a, without libc.a standing a chance to
accidentally override it.

- The pattern matching code which expands command line arguments, as part
of libunix.a, now translates the "*" wildcard into "#?" unless you prefix
it with a backtick ("`"), which is the wildcard pattern escape character
used on AmigaOS.

- Implemented exp2()/exp2f() and log2()/log2f() as suggested by
Henning Nielsen Lund. Thank you very much!

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lstat would overwrite the passed-in name in lstat_lock with ReadLink

- libunix.a now also holds stdlib_main.o, which should fix the issue with
the wildcard pattern expansion functions not getting included.

- Replacing "int" with "socklen_t" in the header files caused compilation
errors with the source code which wasn't using the new typedef yet. Fixed.

- statfs() never stated that a disk was mounted for read-only access
because the wrong InfoData structure member was tested. Fixed.

- Added ftello() and fseeko() which both merely call the equivalent (at
least for clib2) ftell() and fseek() functions, respectively.