main/postgresql: add -dbg subpackage

main/postgresql/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=postgresql
 pkgver=9.3.3
-pkgrel=0
+pkgrel=1
 pkgdesc="A sophisticated object-relational DBMS"
 url="http://www.postgresql.org/"
 arch="all"
@@ -10,7 +10,8 @@ depends="postgresql-client"
 install="$pkgname.pre-upgrade"
 depends_dev="readline-dev openssl-dev zlib-dev libxml2-dev"
 makedepends="$depends_dev"
-subpackages="$pkgname-dev $pkgname-doc libpq $pkgname-client $pkgname-contrib"
+subpackages="$pkgname-dev $pkgname-doc $pkgname-dbg libpq $pkgname-client
+	$pkgname-contrib"
 patches="initdb.patch"
 source="ftp://ftp.$pkgname.org/pub/source/v$pkgver/$pkgname-$pkgver.tar.bz2
 	$patches