bootstrap: Update 'Installing...' messages

bootstrap

@@ -35,11 +35,10 @@ CONFVERSION=$(cat $PKG/package-version.txt)
 
 
 bootstrap () {
-    if [ "${BOOTSTRAP_QUIET}" = "no" ]; then
-        echo "bootstrap:$LINENO: installing 'm4/sage_spkg_configures.m4'"
-        echo "bootstrap:$LINENO: installing 'm4/sage_spkg_versions.m4'"
-    fi
     for a in m4/sage_spkg_configures.m4 m4/sage_spkg_versions.m4 m4/sage_spkg_versions_toml.m4; do
+        if [ "${BOOTSTRAP_QUIET}" = "no" ]; then
+            echo "bootstrap:$LINENO: installing '"$a"'"
+        fi
         rm -f $a
         echo "# Generated by SAGE_ROOT/bootstrap; do not edit" > $a
     done