libc/uClibc: normalize uclibc hidden version names

Hidden version names for uClibc conflicted:

LIBC_UCLIBC_V_0_9_30_2
LIBC_V_0_9_30_1

name them constantly as:
LIBC_UCLIBC_V_<version>

Also update the build script where we use snapshots by version or snapshots by date.

Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>

# ia64 specific config options

# depends on EXPERIMENTAL

config ARCH_ia64

    select ARCH_SUPPORTS_64

    select ARCH_DEFAULT_64

    select ARCH_USE_MMU

    select ARCH_SUPPORTS_BOTH_ENDIAN

    help

      The ia64 architecture, as defined by:

        http://www.intel.com/design/itanium/arch_spec.htm