build.sh: do not install stuff in the conda environment

Let conda take care of its own environment.

Author: Sven Verdoolaege

build.sh

@@ -27,7 +27,7 @@ HALIDE_PREFIX=${HALIDE_PREFIX:=${CONDA_PREFIX}}
 EIGEN_PREFIX=${EIGEN_PREFIX:=${CONDA_PREFIX}}
 CAFFE2_PREFIX=${CAFFE2_PREFIX:=${CONDA_PREFIX}}
 
-THIRD_PARTY_INSTALL_PREFIX=${CONDA_PREFIX}
+THIRD_PARTY_INSTALL_PREFIX=${TC_DIR}/third-party-install
 
 INSTALL_PREFIX=${INSTALL_PREFIX:=${TC_DIR}/install}
 mkdir -p ${INSTALL_PREFIX}