Remove source build from CI.

Author: maleadt

.gitlab-ci.yml

@@ -43,12 +43,12 @@ test:nightly:
 
 # special tests
 
-test:source:llvm9:
-  extends:
-    - .julia:source
-    - .test
-  variables:
-    CI_BUILD_ARGS: 'LLVM_VER=9.0.0 USE_BINARYBUILDER_LLVM=0'
+# test:source:llvm9:
+#   extends:
+#     - .julia:source
+#     - .test
+#   variables:
+#     CI_BUILD_ARGS: 'LLVM_VER=9.0.0 USE_BINARYBUILDER_LLVM=0'
 
 
 # other tasks