Partial port of r59682 from py3k.
On Windows, when import fails to load a dll module, the message says
"error code 193" instead of a more informative text.
It turns out that FormatMessage needs additional parameters for some error codes.
For example: 193 means "%1 is not a valid Win32 application".
Since it is impossible to know which parameter to pass, we use
FORMAT_MESSAGE_IGNORE_INSERTS to get the raw message, which is still better
than the number.
diff --git a/Misc/NEWS b/Misc/NEWS
index bd98e38..fc1c810 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,10 @@
Core and builtins
-----------------
+- Improve some exception messages when Windows fails to load an extension
+ module. Now we get for example '%1 is not a valid Win32 application' instead
+ of 'error code 193'.
+
- Bug #1481296: Fixed long(float('nan'))!=0L.
- Issue #1640: Added math.isinf(x), math.isnan(x) and math.copysign(x, y)