8523a8 weechat: patch autogen.sh to run autoreconf w/o -f so that it doesn't overwrite our config.sub.

Authored and Committed by Lucio Andrés Illanes Albornoz (arab, vxp) 8 years ago
    weechat: patch autogen.sh to run autoreconf w/o -f so that it doesn't overwrite our config.sub.
    build/pkg.build: adds `patch_pre' build step.
    etc/build.usage: updated to document the above.
    
        
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