test_platform fails on OS X Snow Leopard because the UNIX command to get the
canonical version, sw_vers, leaves off trailing zeros in the version number
(e.g. 10.6 instead of 10.6.0). Test now compensates by tacking on extra zeros
for the test comparison.

Fixes issue #6806.
diff --git a/Misc/NEWS b/Misc/NEWS
index dfb2e22..f98706c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -1328,6 +1328,9 @@
 Tests
 -----
 
+- Issue #6806: test_platform failed under OS X 10.6.0 because ``sw_ver`` leaves
+  off the trailing 0 in the version number.
+
 - Issue #5450: Moved tests involving loading tk from Lib/test/test_tcl to
   Lib/lib-tk/test/test_tkinter/test_loadtk. With this, these tests demonstrate
   the same behaviour as test_ttkguionly (and now also test_tk) which is to