build: scripts/config - update to kconfig-v5.14

Functional Changes
---------- -------
- make 'imply' not impose any restrictions: allow symbols implied by y
  to become m
- change "modules" from sub-option to first-level attribute

Bugfixes
--------
- nconf: fix core dump when searching in empty menu
- nconf: stop endless search loops
- xconfig: fix content of the main widget
- xconfig: fix support for the split view mode

Other Changes
----- -------
- highlight xconfig 'comment' lines with '***'
- xconfig: navigate menus on hyperlinks
- xconfig: drop support for Qt4
- improve host ncurses detection

Update the 'option modules' usage to just 'modules' in Config.in.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

scripts/config/.gitignore

@@ -1,22 +1,16 @@
-#
-# Generated files
-#
-*.moc
-*conf-cfg
+# SPDX-License-Identifier: GPL-2.0-only
+/conf
+/[gmnq]conf
+/[gmnq]conf-cfg
+/qconf-moc.cc
+
+# From linux kconfig parent directories
+.*
+
+# OpenWrt-generated files
 mconf_check
 
-#
-# configuration programs
-#
-conf
-mconf
-nconf
-qconf
-gconf
-
-#
-# temporary files from older version.  Should be removed
-#
+# Temporary files from older versions.  They should be removed after the
+# end of support for OpenWrt 19.07.
 zconf.???.c
 zconf.hash.c
-.tmp_qtcheck