boost: bump version to 1.53.0

Hello all,

I have posted a patch in buildroot's patchwork two months ago which bump boost to 1.53.0. The patch is available at :
http://patchwork.ozlabs.org/patch/218673/

The thread in mailing list is available at :
http://lists.busybox.net/pipermail/buildroot/2013-February/066808.html

I use this patch for an apf27 (arm) board and it works fine!

Can anyone could review and/or merge this patch, please? Thanks a lot !

Regards,
Victor Hiairrassary
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