makepkg: install debug symbol packages if requested

When using "makepkg -i", install the debugging symbol packages too
if present.

Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/makepkg.sh.in

@@ -1994,6 +1994,10 @@ install_package() {
 		fullver=$(get_full_version $pkg)
 		pkgarch=$(get_pkg_arch $pkg)
 		pkglist+=("$PKGDEST/${pkg}-${fullver}-${pkgarch}${PKGEXT}")
+
+		if [[ -f "$PKGDEST/${pkg}-debug-${fullver}-${pkgarch}${PKGEXT}" ]]; then
+			pkglist+=("$PKGDEST/${pkg}-debug-${fullver}-${pkgarch}${PKGEXT}")
+		fi
 	done
 
 	if ! run_pacman -U ${pkglist[@]}; then