use new openbsd-6.0 qcow2 image
diff --git a/ci/run-qemu.sh b/ci/run-qemu.sh
index 70f312e..b2f457d 100644
--- a/ci/run-qemu.sh
+++ b/ci/run-qemu.sh
@@ -19,10 +19,7 @@
 
 case $TARGET in
   *-openbsd)
-    pkg_add rust curl gcc-4.8.4p4
-    curl https://static.rust-lang.org/cargo-dist/2015-04-02/cargo-nightly-x86_64-unknown-openbsd.tar.gz | \
-      tar xzf - -C /tmp
-    export PATH=$PATH:/tmp/cargo-nightly-x86_64-unknown-openbsd/cargo/bin
+    pkg_add cargo gcc%4.9 rust
     export CC=egcc
     ;;