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/check.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+# Needed for systems without gettext
+$* -x c -o /dev/null - > /dev/null 2>&1 << EOF
+#include <libintl.h>
+int main()
+{
+	gettext("");
+	return 0;
+}
+EOF
+if [ ! "$?" -eq "0"  ]; then
+	echo -DKBUILD_NO_NLS;
+fi