test_float_overflow(): make shuge (added last week) a little less

huge.  On older Linux systems, the C library's strtod() apparently
gives up before seeing the end of the string when it sees so many
digits that it thinks the result must be Infinity.  (It is wrong, BTW
-- there could be an "e-10000" hiding behind 10,000 digits.)  The
shorter shuge still tests what it's testing, without relying on
strtod() doing a super job.

Lib/test/test_long.py

@@ -371,7 +371,7 @@ def test_float_overflow():
     for x in -2.0, -1.0, 0.0, 1.0, 2.0:
         verify(float(long(x)) == x)
 
-    shuge = '12345' * 1000
+    shuge = '12345' * 120
     huge = 1L << 30000
     mhuge = -huge
     namespace = {'huge': huge, 'mhuge': mhuge, 'shuge': shuge, 'math': math}