glibc: re-enable programs, remove those we don't want

[MilhouseVH]

This restores ldd, getent and locale after they were dropped by #1616, as they're kinda useful...

I've used a simple nested loop, for simplicity. I could have used something more fancy such as:

  findignore=
  for gib in $GLIBC_INCLUDE_BIN; do
    findignore+=" -not -name ${gib}"
  done
  find $INSTALL/usr/bin -type f ${findignore} -delete

but from a scalability point of view I didn't want to get into a situation where we might be calling find with a large number of -not foo arguments (even if that is unlikely) and maybe hit some sort of limit.

So, simple is best.

The combined uncompressed size of these 3 binaries is: 55KB (RPi/RPi2) and 69KB (Generic)