dev-build/automake: Cleanup depends

The automake ./bootstrap script requires the `autom4te` tool.
```
: ${AUTOM4TE=autom4te}
export AUTOM4TE  # ditto
```

If it's not installed the package fails with the following error:
```
sh: line 1: autom4te: command not found
aclocal.tmp: error: autom4te failed with exit status: 127
 * ERROR: sys-devel/automake-1.16.5-r1::portage-stable failed (prepare phase):
 *   (no error message)
 *
 * Call stack:
 *               ebuild.sh, line  125:  Called src_prepare
 *             environment, line 2813:  Called die
 * The specific snippet of code:
 *       ./bootstrap || die;
```

We also need to add autoconf so the wrapper doesn't fail:
```
ac-wrapper: Unable to locate any usuable version of autoconf.
```

We also don't need to declare any DEPEND.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Closes: https://github.com/gentoo/gentoo/pull/32327
Signed-off-by: Sam James <sam@gentoo.org>

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