community/shadow: add libcap-dev to enable HAVE_SYS_CAPABILITY_H

Add `libcap-dev` to `makedepends` for enabling `HAVE_SYS_CAPABILITY_H` flag.
https://github.com/shadow-maint/shadow/blob/4.8.1/libmisc/idmapping.c#L150-L185

Required for https://github.com/moby/buildkit/issues/2038



Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

community/shadow/APKBUILD

@@ -2,12 +2,12 @@
 # Maintainer: Stuart Cardall <developer@it-offshore.co.uk>
 pkgname=shadow
 pkgver=4.8.1
-pkgrel=0
+pkgrel=1
 pkgdesc="PAM-using login and passwd utilities (usermod, useradd, ...)"
 url="http://pkg-shadow.alioth.debian.org/"
 arch="all"
 license="BSD-3-Clause"
-makedepends="linux-pam-dev"
+makedepends="linux-pam-dev libcap-dev"
 subpackages="$pkgname-doc $pkgname-dbg $pkgname-uidmap"
 source="https://github.com/shadow-maint/shadow/releases/download/$pkgver/shadow-$pkgver.tar.xz
 	chpasswd.pamd