This update solves two issues:
 1) Incompatibility with the combination of using Target mpc85xx and uclibc at the same time[1].
   - For now, Boost is disabled when the respective combination is detected.
 2) The selection of Boost.Locale was not activating the build with full language support.

 [1] - https://github.com/openwrt/packages/issues/1621

Signed-off-by: Carlos Ferreira <carlosmf.pt@gmail.com>