Use correct CI test image for WASM and NVPTX

Author: denzp

.travis.yml

@@ -168,7 +168,7 @@ matrix:
       if: branch = auto
     - env: IMAGE=i686-gnu-nopt
       if: branch = auto
-    - env: IMAGE=wasm32-unknown
+    - env: IMAGE=test-various
       if: branch = auto
     - env: IMAGE=x86_64-gnu
       if: branch = auto
@@ -186,8 +186,6 @@ matrix:
       if: branch = auto
     - env: IMAGE=mingw-check
       if: type = pull_request OR branch = auto
-    - env: IMAGE=nvptx-cuda
-      if: branch = auto
 
     - stage: publish toolstate
       if: branch = master AND type = push