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>

#!/bin/sh

SKIP_ME="### CT_NG SKIP ME ###"

skip_me=$(($(cat "${0}" |@@grep@@ --binary-files=text -o -b -E "^${SKIP_ME}$" |cut -d : -f 1)+${#SKIP_ME}+1))

dd if="${0}" bs=${skip_me} skip=1 2>/dev/null |bzcat

exit 0

### CT_NG SKIP ME ###