.redhat-ci.yml: no longer install libubsan & clang

Since they're now part of the auto-built image.

Closes: #572
Approved by: cgwalters

.redhat-ci.yml

@@ -6,11 +6,6 @@ branches:
 container:
     image: projectatomic/ostree-tester
 
-# XXX: we can wipe this off once a newer image is built with
-# it already included
-packages:
-  - libubsan
-
 env:
     CFLAGS: '-fsanitize=undefined'
 
@@ -36,10 +31,6 @@ artifacts:
 
 inherit: true
 
-# XXX: ditto
-packages:
-  - clang
-
 context: Clang
 
 env: