libc/glibc: normalize glibc hidden version names

Hidden version names for glibc conflicted:

LIBC_GLIBC_V_2.10.1
LIBC_V_2.10

name them constantly as:
LIBC_GLIBC_V_<version>

Reported-by: Esben Haabendal <eha@doredevelopment.dk>
Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>

# m68k specific configuration file

# depends on EXPERIMENTAL

config ARCH_m68k

    select ARCH_SUPPORTS_32

    select ARCH_DEFAULT_32

    select ARCH_DEFAULT_BE

    select ARCH_SUPPORT_CPU

     help

      The m68k architecture