Update setup_environment

Throwing an error on updating CUDA is a bit much.
Let's warn them

Author: tgrogers

setup_environment

@@ -49,9 +49,8 @@ CC_VERSION=$(gcc --version | head -1 | awk '{for(i=1;i<=NF;i++){ if(match($i,/^[
 CUDA_VERSION_STRING=`$CUDA_INSTALL_PATH/bin/nvcc --version | awk '/release/ {print $5;}' | sed 's/,//'`;
 export CUDA_VERSION_NUMBER=`echo $CUDA_VERSION_STRING | sed 's/\./ /' | awk '{printf("%02u%02u", 10*int($1), 10*$2);}'`
 if [ $CUDA_VERSION_NUMBER -gt 12800 -o $CUDA_VERSION_NUMBER -lt 2030  ]; then
-	echo "ERROR ** GPGPU-Sim version $GPGPUSIM_VERSION_STRING not tested with CUDA version $CUDA_VERSION_STRING (please see README)";
+	echo "WARNING ** GPGPU-Sim version $GPGPUSIM_VERSION_STRING not tested with CUDA version $CUDA_VERSION_STRING (please see README)";
 	echo $CUDA_VERSION_NUMBER
-    return 1;
 fi
 
 if [ $CUDA_VERSION_NUMBER -ge 6000 ]; then