Add AM_GNU_GETTEXT macros AM_ICONV relies on config.rpath and autopoint/gettextize will only copy these in when the AM_GNU_GETTEXT macros are present. This is needed for the next commit that deletes config.rpath since it is cruft that should be copied in by autotools not embedded. Run autopoint to copy in config.rpath and leave it to automake to copy into the tarball.

Need testing on big-endian machines. We may be missing some LEnn_CPU()
calls.

pst2diii needs header and mime type updates from readpst.

At the next soname bump (to libpst.so.5) we should
    move some of readpst into the shared library, in particular write_normal_email()