Update Makefile.common as part of attempt to fix S3 sync issues (#594)

* Increase clone depth for aws-c-common in Makefile.common to 100

* Empty commit to run tests

* Removed finite depth from clone of aws-c-common

Author: tegansb

.cbmc-batch/jobs/Makefile.common

@@ -149,7 +149,7 @@ common-git:
 	@if [ ! -d $(COMMONDIR) ] ;\
 	then \
 		cd $(BASEDIR); \
-		git clone --quiet --depth 30 https://github.com/awslabs/aws-c-common.git $(COMMON_REPO_NAME); \
+		git clone --quiet https://github.com/awslabs/aws-c-common.git $(COMMON_REPO_NAME); \
     cd $(COMMON_REPO_NAME); \
     git reset --hard dd600468fbd25c6f31828010c28056c4d5c3ab35; \
     cd $(BASEDIR); \