ca-certificates: Fix reproducibilty and multilib issue

ca-certificates: Fix reproducibilty and multilib issue

This command was dependent on the order of files on the disk and for multilib builds
could result in:

Error: Transaction check error:
  file /etc/ca-certificates.conf conflicts between attempted installs of ca-certificates-20190110-r0.core2_32 and lib64-ca-certificates-20190110-r0.x86_64

Sorting the file makes things deterministic.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit c8f329fc562c9eecdcc1cb10d2c7661f44110fb4)
Signed-off-by: Andreas Oberritter <obi@opendreambox.org>