Use 'make olddefconfig' in uClibc/uClibc-ng configuration

instead of 'make oldconfig' and responding 'y'. This avoids 'Broken pipe'
errors in the log, as well as selects default setting for all options not
explicitly set.

This requires a small fix in the old uClibc. Won't have to maintain that fix
for long though :)

Signed-off-by: Alexey Neyman <stilor@att.net>

scripts/functions

@@ -585,14 +585,6 @@ CT_DoForceRmdir() {
     done
 }
 
-# Echoes the specified string on stdout until the pipe breaks.
-# Doesn't fail
-# $1: string to echo
-# Usage: CT_DoYes "" |make oldconfig
-CT_DoYes() {
-    yes "$1" || true
-}
-
 # Add the specified directory to LD_LIBRARY_PATH, and export it
 # If the specified patch is already present, just export
 # $1: path to add