Memory leak since patch 20211106

[Dr. Werner Fink]

Hi,

since 20211106 we face a memory leak in the curses based tree of our
installer[1].

 20211106
        + improve check in misc/Makefile.in for empty $PKG_CONFIG_LIBDIR
        + modify wnoutrefresh to call pnoutrefresh if its parameter is a pad,
          rather than treating it as an error, and modify new_panel to permit
          its window-parameter to be a pad (report by Giorgos Xou).
        + fix a memory-leak in del_curterm (prompted by discussion with Bram
          Moolenaar, cf: 20210821).

as the last change removes a memory-leak, I guess it is within the new
pad distinction:

 nm -D /usr/lib64/yui/libyui-ncurses.so.15 | grep pad
                 U keypad
                 U newpad

Werner

[1] https://bugzilla.opensuse.org/show_bug.cgi?id=1192668

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