…encies (python#119816)(cherry picked from commitf80376b)1. Use pkg-config to check for ncursesw/panelw. If that fails, use   pkg-config to check for ncurses/panel.2. Regardless of pkg-config output, search for curses/panel headers, so   we're sure we have all defines in pyconfig.h.3. Regardless of pkg-config output, check if libncurses or libncursesw   contains the 'initscr' symbol; if it does _and_ pkg-config failed   earlier, add the resulting -llib linker option to CURSES_LIBS.   Ditto for 'update_panels' and PANEL_LIBS.4. Wrap the rest of the checks with WITH_SAVE_ENV and make sure we're   using updated LIBS and CPPFLAGS for those.Add the PY_CHECK_CURSES convenience macro.