[Buildroot] QUILT helper

[Viallard Anthony]

Hi,

It will be nice having a quilt helper like openwrt has.

  QUILT=1 make ofono

Et voilà, with this command, builroot use quilt to apply patches. So, if 
you need to edit a patch, you just go in the build dir, use quilt pop, 
quilt refresh, quilt push -a and use a new command to update the eddited 
patch :

  make ofono-refresh

I known christmas was few days ago but if you include this idea, I will 
be happy like when santa claus gave me a SEGA master system.

Best regards,
avd.

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