remove --try-amend=keeppreviousinstall=True, add proper EB flags for builds and rebuilds

Author: bedroge

EESSI-install-software.sh

@@ -390,11 +390,7 @@ else
             echo_green "Feeding easystack file ${easystack_file} to EasyBuild..."
 
             if [[ ${easystack_file} == *"/rebuilds/"* ]]; then
-                # the removal script should have removed the original directory and created a new and empty one
-                # to work around permission issues:
-                # https://github.com/EESSI/software-layer/issues/556
-                echo_yellow "This is a rebuild, so using --try-amend=keeppreviousinstall=True to reuse the already created directory"
-                ${EB} --easystack ${easystack_file} --robot --try-amend=keeppreviousinstall=True
+                ${EB} --easystack ${easystack_file} --rebuild
             else
                 ${EB} --easystack ${easystack_file} --robot
             fi