Fix name of 32-bit nexes to make create_nmf happy

Fix name of 32-bit nexes to make create_nmf happy.
Unfortunetely the current version of create_nmf requires
that 32-bit and 64-bit newlib nexes end with _32 and _64
respectively.  Prior to this change the VS addin was
calling the 32-bit ones _i686.nexe.


BUG=

Committed: https://code.google.com/p/nativeclient-sdk/source/detail?r=1443

[Sam Clegg, 2012-10-11 00:28:16]

Hopefully the last bug fix needed for the public release.
(at least by last fix of the day :)

[binji, 2012-10-11 00:32:50]

lgtm