new Erlang macros for testing for modules, functions, etc.

[Romain Lenglet]

Hi,

Here is a series of patches for 1) fixing the command line used for 
AC_RUN_IFELSE so that the run fails if the module doesn't compile (patch 
0001), and 2) adding 4 new macros to test for modules, functions, and headers 
(patches 0002-0004) with their doc and tests.

I have split the changes into 4 patches, to hopefully make your review easier.

Best regards,
--
Romain Lenglet

0001-Make-AC_RUN_IFELSE-fail-for-Erlang-if-the-program-do.patch
Description: Text Data

0002-Add-macro-AC_ERLANG_CHECK_FUNC-with-doc-and-tests.patch
Description: Text Data

0003-Add-macro-AC_ERLANG_CHECK_MOD-with-doc-and-tests.patch
Description: Text Data

0004-Add-macros-AC_ERLANG_CHECK_LIB_HEADER-and-AC_ERLANG_.patch
Description: Text Data