tests: Install missing libraries for things installed in /usr too

test/test-functions

@@ -282,7 +282,7 @@ get_ldpath() {
 
 install_missing_libraries() {
     # install possible missing libraries
-    for i in $initdir/{sbin,bin}/* $initdir/lib/systemd/*; do
+    for i in $initdir{,/usr}/{sbin,bin}/* $initdir{,/usr}/lib/systemd/*; do
         LD_LIBRARY_PATH=$(get_ldpath $i) inst_libs $i
     done
 }