build: Add kconfig menu system.

This is an initial commit of the kconfig system.  It is an unmodified
copy from Linux v3.16.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

scripts/kconfig/.gitignore

@@ -0,0 +1,22 @@
+#
+# Generated files
+#
+config*
+*.lex.c
+*.tab.c
+*.tab.h
+zconf.hash.c
+*.moc
+gconf.glade.h
+*.pot
+*.mo
+
+#
+# configuration programs
+#
+conf
+mconf
+nconf
+qconf
+gconf
+kxgettext