Unbreak CUDA pipelines

This is messing up CI for everyone and I don't want to wait for Mooncake and other CUDA 6 commits.

Author: kshyatt

.buildkite/pipeline.yml

@@ -14,6 +14,8 @@ steps:
     agents:
       queue: "juliagpu"
       cuda: "*"
+    commands: |                                                                                                                                                                                            
+      unset LD_LIBRARY_PATH 
     if: build.message !~ /\[skip tests\]/
     timeout_in_minutes: 30
 
@@ -29,6 +31,8 @@ steps:
     agents:
       queue: "juliagpu"
       cuda: "*"
+    commands: |                                                                                                                                                                                            
+      unset LD_LIBRARY_PATH 
     if: build.message !~ /\[skip tests\]/
     timeout_in_minutes: 30