Make.erl: Using environment variable in Emakefile

[Mickael Remond]

Hello,

Here is a small change that I find very usefull for me. It allows me to 
use environment variable to make some part of Erlang Emakefile 
configurable. This is very usefull to compile Erlang modules that have 
dependancies with other Erlang software. You can thus configure 
environment variable to define where dependant software reside on your 
own system.

Environment variable substitution is triggered by the use of double 
percent before and after the environment variable name in attributes 
value. For example:

{'src/ejabberd_app.erl', [{outdir, "ebin"}, {i, "%%EJABBERD_SO_PATH%%"}]}.

Please tell me if you want me to change something, if this could help 
integration with Erlang/OTP

-- 
Mickaël Rémond
  http://www.erlang-projects.org/
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