Enable sanitizer for Arch instead since it's using a newer compiler

Author: marcomagdy

ci/codebuild/arch-linux.yml

@@ -4,6 +4,6 @@ phases:
   build:
     commands:
       - echo Build started on `date`
-      - ./ci/codebuild/build.sh -DTEST_RESOURCE_PREFIX=lambda-cpp-archbtw
+      - ./ci/codebuild/build.sh -DTEST_RESOURCE_PREFIX=lambda-cpp-archbtw -DENABLE_SANITIZERS=ON
       - ./ci/codebuild/run-tests.sh aws-lambda-package-lambda-test-fun
       - echo Build completed on `date`

ci/codebuild/ubuntu-18.04.yml

@@ -4,6 +4,6 @@ phases:
   build:
     commands:
       - echo Build started on `date`
-      - ./ci/codebuild/build.sh -DTEST_RESOURCE_PREFIX=lambda-cpp-ubuntu1804 -DENABLE_SANITIZERS=ON
+      - ./ci/codebuild/build.sh -DTEST_RESOURCE_PREFIX=lambda-cpp-ubuntu1804
       - ./ci/codebuild/run-tests.sh aws-lambda-package-lambda-test-fun
       - echo Build completed on `date`