toolchain/crosstool-NG: update bundled config files

Update the crosstool-NG libc-specific config files to match the
new set of options coming with the updated crosstool-NG.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>