Remove useless MKL target (#12783)

Summary:
Context: https://github.com/pytorch/pytorch/pull/12625#issuecomment-430560919
Pull Request resolved: https://github.com/pytorch/pytorch/pull/12783

Differential Revision: D10451726

Pulled By: yinghai

fbshipit-source-id: 3cd1e61209628d7c52b440e5b232ae95dd09885e
diff --git a/caffe2/python/CMakeLists.txt b/caffe2/python/CMakeLists.txt
index b182fb6..e74491a 100644
--- a/caffe2/python/CMakeLists.txt
+++ b/caffe2/python/CMakeLists.txt
@@ -6,14 +6,6 @@
     "/pybind_state_registry.cc"
 )
 
-# ---[ MKL binding
-if(USE_MKL AND USE_MKLML)
-  set(Caffe2_CPU_PYTHON_SRCS
-      ${Caffe2_CPU_PYTHON_SRCS}
-      "/pybind_state_mkl.cc"
-  )
-endif()
-
 # ---[ GPU files
 set(Caffe2_GPU_PYTHON_SRCS
     ${Caffe2_CPU_PYTHON_SRCS}