update image name for DEPLOY_ALT

Author: TimNN

.travis.yml

@@ -112,7 +112,7 @@ matrix:
     # turned on, they're deployed to a different location primarily for projects
     # which are stuck on nightly and don't want llvm assertions in the artifacts
     # that they use.
-    - env: IMAGE=dist-x86-linux DEPLOY_ALT=1
+    - env: IMAGE=dist-x86_64-linux DEPLOY_ALT=1
     - env: >
         RUST_CHECK_TARGET=dist
         RUST_CONFIGURE_ARGS="--enable-extended"