explain why I can't simply use autoreconf
simplify bootstrap script
Bundle config.rpath and iconv.m4

configure.ac uses the m4 macro AM_ICONV (iconv.m4), which depends on
config.rpath.

However, iconv.m4 and config.rpath are bundled with GNU gettext, and
therefore config.rpath is automatically installed with a `autopoint`
(formerly `gettextize`) run. However, DVDAuthor doesn't use gettext,
and therefore when you use `autoreconf`, it it skips over `autopoint`,
and therefore skipping over installing config.rpath.

Right now the bootstrap script works around this by:

    cp /usr/share/gettext/config.rpath autotools/

The only sane solution is to bundle config.rpath (and even iconv.m4)
with the source. Or you will need to add a dependency on gettext,
which is not even used by DVDAuthor. Even worse, you have to use a
`cp` hack.
Remove bootstrap script

It is the same as `autoreconf -i` now since the last commit.