main/frotz: use builddir and default prepare

main/frotz/APKBUILD

@@ -14,25 +14,15 @@ install=""
 subpackages="$pkgname-doc"
 source="${pkgname}-${pkgver}.tar.gz::https://github.com/DavidGriffith/${pkgname}/archive/${pkgver}.tar.gz
 	Makefile.patch"
-
-_builddir="$srcdir/$pkgname-${pkgver}"
-prepare() {
-	local i
-	cd "$_builddir"
-	for i in $source; do
-		case $i in
-		*.patch) msg $i; patch -p1 -i "$srcdir"/$i || return 1;;
-		esac
-	done
-}
+builddir="$srcdir/$pkgname-${pkgver}"
 
 build() {
-	cd "$_builddir"
+	cd "$builddir"
 	make
 }
 
 package() {
-	cd "$_builddir"
+	cd "$builddir"
 	strip $pkgname
 	install -m755 -d "${pkgdir}/usr/bin"
 	install -m755 -d "${pkgdir}/usr/share/man/man6"