Issue #28190: Cross compiling the _curses module does not use anymore

/usr/include/ncursesw as a headers search path.

configure

@@ -15690,7 +15690,9 @@ fi
 
 # first curses header check
 ac_save_cppflags="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
+if test "$cross_compiling" = no; then
+  CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
+fi
 
 for ac_header in curses.h ncurses.h
 do :

configure.ac

@@ -4885,7 +4885,9 @@ fi
 
 # first curses header check
 ac_save_cppflags="$CPPFLAGS"
-CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
+if test "$cross_compiling" = no; then
+  CPPFLAGS="$CPPFLAGS -I/usr/include/ncursesw"
+fi
 
 AC_CHECK_HEADERS(curses.h ncurses.h)
 

setup.py

@@ -1349,6 +1349,7 @@ class PyBuildExt(build_ext):
         panel_library = 'panel'
         if curses_library == 'ncursesw':
             curses_defines.append(('HAVE_NCURSESW', '1'))
+            if not cross_compiling:
                 curses_includes.append('/usr/include/ncursesw')
             # Bug 1464056: If _curses.so links with ncursesw,
             # _curses_panel.so must link with panelw.