zfs: fix cross build

srcpkgs/zfs/template

@@ -23,9 +23,11 @@ dkms_modules="zfs ${version/r/-}"
 depends="dkms>=2.2.0.3_9 spl>=${version}"
 
 pre_configure() {
+	export CFLAGS+=" -I${XBPS_CROSS_BASE}/usr/include/tirpc/"
 	autoreconf -fi
 	tar czf ../clean.tar.gz .
 }
+
 post_install() {
 	vlicense COPYRIGHT
 	vlicense OPENSOLARIS.LICENSE
@@ -37,6 +39,7 @@ post_install() {
 	rm -rf ${DESTDIR}/usr/lib/systemd
 	rm -rf ${DESTDIR}/usr/share/initramfs-tools
 }
+
 zfs-devel_package() {
 	depends="${sourcepkg}>=${version}_${revision}"
 	short_desc="Z File System -- development files"
@@ -46,6 +49,7 @@ zfs-devel_package() {
 		vmove "usr/lib/*.so"
 	}
 }
+
 do_clean() {
 	rm -f ../clean.tar.gz
 }