Auto merge of #28241 - dhuseby:adding_openbsd_snapshot, r=alexcrichton

@alexcrichton please upload this snapshot when landing:

https://github.com/dhuseby/rust-manual-snapshots/raw/master/rust-stage0-2015-08-11-1af31d4-openbsd-x86_64-9cae790c4ca19b1b29a048605ce249fe1c20a498.tar.bz2

BTW, this is the snapshot that @semarie has published on his website for use in the OpenBSD port for rust.  Credit goes to him.

Author: bors

src/snapshots.txt

@@ -7,6 +7,7 @@ S 2015-08-11 1af31d4
   linux-x86_64 7df8ba9dec63ec77b857066109d4b6250f3d222f
   macos-i386 29750870c82a0347f8b8b735a4e2e0da26f5098d
   macos-x86_64 c9f2c588238b4c6998190c3abeb33fd6164099a2
+  openbsd-x86_64 9cae790c4ca19b1b29a048605ce249fe1c20a498
   winnt-i386 dc01ac690efdcc40eb6fd8154205a1f21893eb6c
   winnt-x86_64 1464a2e54768498222277f904ccd559e27608950