Define a macro directory in the autotools build

As libtool suggest we do; this also allows using ACLOCAL_AMFLAGS inside
build that create a separate environment with their own m4 macros, like
jhbuild and Cerberus.

In order to avoid a warning from autoreconf, we create the empty macros
directory during the autogen.sh step; aclocal would create the directory
for us anyway, but different versions of autotools may have different
behaviours.

Closes: #58

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