speech-dispatcher: fix included version string

This fixes the version pkg-config file and resolves #26348,
as mumble asks pkg-config for --atleast-version=0.8 and
without a version it won't find the system speech-dispatcher.

srcpkgs/speech-dispatcher/template

@@ -1,7 +1,7 @@
 # Template file for 'speech-dispatcher'
 pkgname=speech-dispatcher
 version=0.10.1
-revision=1
+revision=2
 wrksrc="speechd-${version}"
 build_style=gnu-configure
 # Disable support for sundry non-free TTS systems (said support causes
@@ -26,6 +26,11 @@ conf_files="
 
 CFLAGS="-fcommon"
 
+post_extract() {
+	[ -e ".tarball-version" ] || echo "${version}" >.tarball-version
+	[ -e ".version" ] || echo "${version}" >.version
+}
+
 pre_configure() {
 	autoreconf -fi
 }