new AC_ERLANG_SUBST_ERTS_VER macro

[Romain Lenglet]

Hi,

Here is a small patch for the Erlang support.
It defines a substitution variable containing the Erlang runtime system (ERTS) 
version. That's very useful for substituting in Erlang release resource files, 
which are commonly used in Erlang.

I have updated the doc, putting an emphasis on not using the version numbers 
for testing for features.

I have added Ruslan Babayev into THANKS, as this code is originally from him.

BR,
--
Romain Lenglet

autoconf_erlang_subst_erts_ver_2009-05-24.diff
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