Convert all xbps-base-chroot pkgs to subpkgs.

Also introduce "libs.depends", that adds a rundep of a package
with a proper version. This is to avoid modifying all dependent
packages if there's an API/ABI change.

--HG--
extra : convert_revision : a46b11b8e9187bdb2bfc954ad5ff40ecd9c0fe31

templates/tar/template

@@ -1,5 +1,6 @@
 # Template build file for 'tar'.
 pkgname=tar
+sourcepkg=tar
 version=1.20
 distfiles="http://ftp.gnu.org/gnu/tar/$pkgname-$version.tar.bz2"
 build_style=gnu_configure
@@ -14,3 +15,4 @@ long_desc="
  does not create "correct" ustar archives."
 
 base_chroot=yes
+subpackages="base docs locale"