Remove unused target --- compactor_test
Remove unused target --- compactor_test

Summary:
Remove compactor_test, which depends on a directory not exist
in our code base.
    make compactor_test
    GEN      util/build_version.cc
    GEN      util/build_version.cc
    make: *** No rule to make target `utilities/compaction/compactor_test.o', needed by `compactor_test'.  Stop.

Test Plan: verify the output message of make compactor_test

Reviewers: rven, anthony, kradhakrishnan, igor, IslamAbdelRahman, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D40341

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/rocksdb,norton/rocksdb,vmx/rocksdb,makelivedotnet/rocksdb,flabby/rocksdb,ylong/rocksdb,kaschaeffer/rocksdb,Andymic/rocksdb,vashstorm/rocksdb,facebook/rocksdb,tsheasha/rocksdb,wenduo/rocksdb,Applied-Duality/rocksdb,Andymic/rocksdb,mbarbon/rocksdb,Applied-Duality/rocksdb,jalexanderqed/rocksdb,luckywhu/rocksdb,SunguckLee/RocksDB,IMCG/RcoksDB,temicai/rocksdb,facebook/rocksdb,skunkwerks/rocksdb,vashstorm/rocksdb,IMCG/RcoksDB,mbarbon/rocksdb,jalexanderqed/rocksdb,anagav/rocksdb,OverlordQ/rocksdb,tsheasha/rocksdb,IMCG/RcoksDB,Applied-Duality/rocksdb,bbiao/rocksdb,ryneli/rocksdb,vmx/rocksdb,kaschaeffer/rocksdb,zhangpng/rocksdb,norton/rocksdb,sorphi/rocksdb,siddhartharay007/rocksdb,JoeWoo/rocksdb,jalexanderqed/rocksdb