main/curl: add ca-certificates as dep

git is for instance not usable against https repos without valid
root certs to check against.

main/curl/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=curl
 pkgver=7.33.0
-pkgrel=0
+pkgrel=1
 pkgdesc="An URL retrival utility and library"
 url="http://curl.haxx.se"
 arch="all"
 license="MIT"
-depends=
+depends="ca-certificates"
 depends_dev="zlib-dev openssl-dev libssh2-dev"
 makedepends="$depends_dev"
 source="http://curl.haxx.se/download/curl-$pkgver.tar.bz2"