remobe duplicate env setup

Author: smuzaffar

torch-build-env.file

@@ -29,7 +29,6 @@ export USE_SYSTEM_PSIMD=ON
 export PSIMD_SOURCE_DIR=${PSIMD_ROOT}
 export BUILD_CUSTOM_PROTOBUF=OFF
 export USE_SYSTEM_EIGEN_INSTALL=ON
-export USE_SYSTEM_PSIMD=ON
 export USE_SYSTEM_FXDIV=ON
 export USE_SYSTEM_PYBIND11=ON
 export PYBIND11_SYSPATH=${PY3_PYBIND11_ROOT}
@@ -54,9 +53,7 @@ export USE_NUMA=ON
 export NUMA_ROOT_DIR=${NUMACTL_ROOT}
 export USE_NUMPY=OFF
 export USE_OPENMP=ON
-export USE_QNNPACK=OFF
 export USE_VALGRIND=OFF
-export USE_XNNPACK=OFF
 export USE_MKLDNN=OFF
 export USE_DISTRIBUTED=OFF
 export USE_MPI=ON