main/lzo: Add -doc subpackage. Minor cleanups in APKBUILD

main/lzo/APKBUILD

+# Contributor: Valery Kartel <valery.kartel@gmail.com>
 # Contributor: Michael Mason <ms13sp@gmail.com>
 # Maintainer: Michael Mason <ms13sp@gmail.com>
 pkgname=lzo
 pkgver=2.09
-pkgrel=0
+pkgrel=1
 pkgdesc="LZO -- a real-time data compression library"
 url="http://www.oberhumer.com/opensource/lzo"
 arch="all"
@@ -10,14 +11,10 @@ license="GPL"
 depends=""
 makedepends=""
 install=
-subpackages="$pkgname-dev"
+subpackages="$pkgname-dev $pkgname-doc"
 source="http://www.oberhumer.com/opensource/lzo/download/$pkgname-$pkgver.tar.gz"
 
-_builddir="$srcdir/$pkgname-$pkgver"
-
-prepare() {
-	cd "$_builddir"
-}
+_builddir="$srcdir"/$pkgname-$pkgver
 
 build() {
 	cd "$_builddir"
@@ -34,7 +31,7 @@ build() {
 }
 
 package() {
-	cd "$srcdir/$pkgname-$pkgver"
+	cd "$_builddir"
 	make DESTDIR="$pkgdir" install || return 1
 }