Closes SF bug #568577.

Look in both moddirlist and incdirlist, since a .h could be in either.

Two new tests are needed:

Don't skip building an extension if any of the depends files are newer
than the target.

Pass ext.depends to compiler.compile() so that it can track individual
files.

Always use _setup_compile() to do the grunt work of processing
arguments, figuring out which files to compile, and emitting debug
messages for files that are up-to-date.

Use _get_cc_args() when possible.

This change is not backwards compatible.  If a compiler subclass
exists outside the distutils package, it may get called with the
unexpected keyword arg.  It's easy to extend that compiler by having
it ignore the argument, and not much harder to do the right thing.  If
this ends up being burdensome, we can change it before 2.3 final to
work harder at compatibility.

Also add _setup_compile() and _get_cc_args() helper functions that
factor out much of the boilerplate for each concrete compiler class.

pyconfig.h.

DNS, and we can't assume that.

that retries the connect() call in timeout mode so it can be shared
between connect() and connect_ex(), and needs only a single #ifdef.

The test for this was doing funky stuff I don't approve of,
so I removed it in favor of a simpler test.  This allowed me
to implement a simpler, "purer" form of the timeout retry code.
Hopefully that's enough (if you want to be fancy, use non-blocking
mode and decode the errors yourself, like before).

Remove __init__ that just called base class __init__ with same args.
Fold long argument lists into fewer, shorter lines.
Remove parens in tuple unpacks.
Don't put multiple statements on one line with a semicolon.
In find_library_file() compute the library_filename() upfront.

- setblocking(0) and settimeout(0) are now equivalent, and ditto for
  setblocking(1) and settimeout(None).

- Don't raise an exception from internal_select(); let the final call
  report the error (this means you will get an EAGAIN error instead of
  an ETIMEDOUT error -- I don't care).

- Move the select to inside the Py_{BEGIN,END}_ALLOW_THREADS brackets,
  so other theads can run (this was a bug in the original code).

- Redid the retry logic in connect() and connect_ex() to avoid masking
  errors.  This probably doesn't work for Windows yet; I'll fix that
  next.  It may also fail on other platforms, depending on what
  retrying a connect does; I need help with this.

- Get rid of the retry logic in accept().  I don't think it was needed
  at all.  But I may be wrong.

Add a sleep (yuck!) to _testRecvFrom() so the server can set up first.

Making the world better a little bit at a time <wink>.

constributed by David Abrahams.
This closes SF patch #568081.

string with a [::-1] slice.

Closes SF patch #567867.

using "".join().  Fold a long line.

nonzero value is OK.  Also fixed the error message for this and for
testGetSockOpt().

information on what went wrong.

depends is a list of files that the target depends, but aren't direct
sources of the target.  think .h files.

settimeout(), test settimeout(None), and the interaction between
settimeout() and setblocking().

Changed test_timeout.py to conform to the guidelines in Lib/test/README.

['BINARY_FLOOR_DIVIDE', 'BINARY_TRUE_DIVIDE',
'INPLACE_FLOOR_DIVIDE', 'INPLACE_TRUE_DIVIDE', 'GET_ITER',
'YIELD_VALUE', 'FOR_ITER', 'CONTINUE_LOOP']

of a new-style instance are detected by the garbage collector.

This was a simple typo.  Strange that the compiler didn't catch it!
Instead of WHY_CONTINUE, two tests used CONTINUE_LOOP, which isn't a
why_code at all, but an opcode; but even though 'why' is declared as
an enum, comparing it to an int is apparently not even worth a
warning -- not in gcc, and not in VC++. :-(

Will fix in 2.2 too.

code is directed to the Shell.

also call using_history() to properly initialize history variables

since the URLopener base class does and **kwargs are used in urlopen.