net-dns/nsd: Run eautoreconf else some pkg-config macros are missing

Closes: https://bugs.gentoo.org/758050
Package-Manager: Portage-3.0.11, Repoman-3.0.2
Signed-off-by: Lars Wendler <polynomial-c@gentoo.org>

net-dns/nsd/nsd-4.3.4.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=7
 
-inherit systemd
+inherit autotools systemd
 
 # version voodoo needed only for non-release tarballs: 4.0.0_rc1 => 4.0.0rc1
 MY_PV="${PV/_beta/b}"
@@ -48,6 +48,13 @@ PATCHES=(
 	"${FILESDIR}"/nsd_munin_.patch
 )
 
+src_prepare() {
+	default
+	# Required to get correct pkg-config macros with USE="systemd"
+	# see bugs #663618 and #758050
+	eautoreconf
+}
+
 src_configure() {
 	local myeconfargs=(
 		--enable-largefile