libc/eglibc: add 2.11 and 2.12 branches.
Also fix typo s/LIBC_V_2_10/EGLIBC_V_2_10/
1 This is NOT the official version of dialog. This version has been
2 significantly modified from the original. It is for use by the Linux
3 kernel configuration script. Please do not bother Savio Lam with
4 questions about this program.