Add make clean command

specfem3d/compile.sh

@@ -79,6 +79,7 @@ Install(){
     #    sed -i s/"MEMORY_INSTALLED_PER_CORE_IN_GB = 2.5d0"/"MEMORY_INSTALLED_PER_CORE_IN_GB = 50d0"/g DATA/Par_file
     #fi
     echo "===> Build"
+    make clean
     time -p make -j 12 all >& make.log &
 }