dev-db/rum: bump compat to pg16, fix multi-target build

Signed-off-by: Haelwenn (lanodan) Monnier <contact@hacktivis.me>

dev-db/rum/rum-1.3.13-r1.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=7
 
-POSTGRES_COMPAT=( 9.6 10 11 12 13 14 15 )
+POSTGRES_COMPAT=( 9.6 10 11 12 13 14 15 16 )
 POSTGRES_USEDEP="server"
 
 inherit postgres-multi
@@ -22,6 +22,11 @@ RDEPEND="${DEPEND}"
 # Needs a running PostgreSQL server
 RESTRICT="test"
 
+src_prepare() {
+	sed -i 's;^PG_CONFIG =;PG_CONFIG ?=;' Makefile || die
+	postgres-multi_src_prepare
+}
+
 src_compile() {
 	postgres-multi_foreach emake USE_PGXS=1
 }