Reverted from rev 1.45.6.1 to rev 1.45: deep recursion is still part of

Reverted from rev 1.45.6.1 to rev 1.45:  deep recursion is still part of
sre in 2.3, and the backport of the 2.4 version of the tests should not
have been done.  It got confused because someone else checked a bad
change into _sre.c that caused the tests that are *supposed* to raise
a recursion exception to stop doing so on some (most?) platforms.

test_re passes again on Windows now.  Until the bad change to _sre gets
fixed, it will fail on platforms other than Windows and FreeBSD, either
by "Test Failed", or by bad consequences of C stack overflow.