improve configure script's ability to find erl_driver.h
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                 Key: COUCHDB-162
                 URL: https://issues.apache.org/jira/browse/COUCHDB-162
             Project: CouchDB
          Issue Type: Improvement
          Components: Build System
            Reporter: Adam Kocoloski
            Priority: Minor


Hi, if I configure and install Erlang with a custom --prefix=/path/to/erlang, 
CouchDB's configure script finds `erl` and `erlc` from the environment, but it 
usually needs to be told about the location or erl_driver.h:

./configure --with-erlang=/path/to/erlang/lib/erlang/usr/include

It'd be nice if the configure script could check that location automatically, 
e.g. determining /path/to/erlang by stripping bin/erl off the path to `erl` 
that it found earlier.  

Alternatively, I think --with-erlang ought to be modified to take the path to 
the base of the Erlang installation, rather than the exact path to the location 
of the folder containing erl_driver.h.  Best,

Adam

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