toolchain/ct-ng: update to 1.13.0

Update the version in the package description. Update the default
configuration files for the three different C libraries.

[Peter: Removed unneeded changes as noticed by Baruch Siach]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>