Allow selecting 'latest' snapshot, as well as 'specific' date snapshot for glibc.
Update uClibc config to commonalise some help.

/trunk/scripts/build/libc_glibc.sh | 22 20 2 0 ++++++++++++++++++++--
/trunk/config/libc/glibc.in | 12 12 0 0 ++++++++++++
/trunk/config/libc/uClibc.in | 12 4 8 0 ++++--------
/trunk/config/libc.in | 13 13 0 0 +++++++++++++
4 files changed, 49 insertions(+), 10 deletions(-)

 # Kernel options

 menu "Kernel"

 choice

     bool

     prompt "Target OS"

     default KERNEL_LINUX

 config KERNEL_LINUX

     bool

     prompt "linux"

     help

       Build a toolchain targeting systems running Linux as a kernel.

 endchoice

 config KERNEL_VERSION

     string

 if KERNEL_LINUX

 source config/kernel/linux.in

 endif

 endmenu