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Function filter_same() must be called with arguments in proper order,
otherwise it breaks the new filter, causing crash during route
processing.

The same is already done for clists. Also fixes defined() to work
properly for paths and clists.

Should use remote value, not local value.

According to GNU Readline developers, if we link with libreadline then
there is no need to link with libhistory at all.

Based on patch from Pavel Tvrdik

Also change linpool.current ptr to really point to thr current chunk.

Old code breaks with some versions of bison

ECMP is not enabled on BSD, where it is not supported by BIRD.