Fix MKL builds on Ubuntu (pytorch#50212)

Summary:
This fixes pytorch#50211

Pull Request resolved: pytorch#50212

Reviewed By: janeyx99

Differential Revision: D25850876

Pulled By: walterddr

fbshipit-source-id: be138db3ae370c45f5fbf3af486cf8b32518df87

CMakeLists.txt

@@ -318,7 +318,7 @@ set(OP_DEPENDENCY "" CACHE STRING
 # symbol lookup error: miniconda3/envs/pytorch-py3.7/lib/libmkl_intel_lp64.so: undefined symbol: mkl_blas_dsyrk
 # https://software.intel.com/en-us/articles/symbol-lookup-error-when-linking-intel-mkl-with-gcc-on-ubuntu
 if(LINUX)
-  set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-as-needed ${CMAKE_SHARED_LINKER_FLAGS}")
+  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-as-needed")
 endif()
 
 if(MSVC)