net-im/ejabberd: pass --with-rebar=rebar to use rebar 2

ejabberd 24.02 started to use rebar 3 as default build system. This
broke the ebuild, since rebar.eclass sill uses rebar 2. Passing
--with-rebar=rebar switches this back to rebar 2.

Thanks to Holger Weiß for pointing this out.

Closes: https://bugs.gentoo.org/926799
Signed-off-by: Florian Schmaus <flow@gentoo.org>

net-im/ejabberd/ejabberd-24.02-r1.ebuild

@@ -122,6 +122,7 @@ src_configure() {
 		--docdir="${EPREFIX}/usr/share/doc/${PF}/html" \
 		--localstatedir="${EPREFIX}/var" \
 		--enable-user=${PN} \
+		--with-rebar=rebar \
 		$(use_enable debug) \
 		$(use_enable full-xml) \
 		$(use_enable mssql) \