main/mkinitfs: use --never-overwrite apk option

fixes #197

main/mkinitfs/0001-init-never-overwrite-existing-files.patch

+From bf94c9b9aa7884fc50d3110d69e2d28e413159ed Mon Sep 17 00:00:00 2001
+From: Natanael Copa <ncopa@alpinelinux.org>
+Date: Tue, 24 Nov 2009 12:23:38 +0000
+Subject: [PATCH] init: never overwrite existing files
+
+ref #197
+---
+ initramfs-init.in |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/initramfs-init.in b/initramfs-init.in
+index 04798de..bd97ace 100755
+--- a/initramfs-init.in
++++ b/initramfs-init.in
+@@ -372,7 +372,7 @@ if [ -n "$KOPT_chart" ]; then
+ fi
+ apkflags="--initdb --quiet --progress --force --no-network"
+ if [ -z "$KOPT_keep_apk_new" ]; then
+-	apkflags="$apkflags --clean-protected"
++	apkflags="$apkflags --clean-protected --never-overwrite"
+ fi
+ apk add --root $sysroot $repo_opt $apkflags $pkgs >/dev/null
+ eend $?
+-- 
+1.6.5.3
+

main/mkinitfs/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=mkinitfs
 pkgver=2.0_rc6
-pkgrel=0
+pkgrel=1
 pkgdesc="Tool to generate initramfs images for Alpine"
 url=http://git.alpinelinux.org/cgit/mkinitfs
-depends="busybox"
+depends="busybox apk-tools>=2.0_rc7"
 triggers="$pkgname.trigger:/usr/share/kernel/*"
 source="http://git.alpinelinux.org/cgit/$pkgname/snapshot/$pkgname-$pkgver.tar.bz2
+	0001-init-never-overwrite-existing-files.patch
 	"
 license="GPL-2"
 
 build() {
 	cd "$srcdir"/$pkgname-$pkgver
 
+	patch -p1 -i ../0001-init-never-overwrite-existing-files.patch || return 1
 	make || return 1
 	make install DESTDIR="$pkgdir" || return 1
 }
-md5sums="6b8945b2e3be747caf8cfb29230f180e  mkinitfs-2.0_rc6.tar.bz2"
+md5sums="6b8945b2e3be747caf8cfb29230f180e  mkinitfs-2.0_rc6.tar.bz2
+921aadd7e302d5e565e539e611be946e  0001-init-never-overwrite-existing-files.patch"