system: add mkdir -p to S90crond
cups: install sysv startup script
openssh: fixup sysv startup script
rpi-userland: remove execute bit from S94vcfiled
postscript: dont install fstab with execute permissions
system: remove lock file from S90crond
skeleton: fixup S20urandom
board/ryco/configs: add raspberry pi project configs

Signed-off-by: Ryan Coe <bluemrp9@gmail.com>
package/nettle: fix shared-only build

Changeset f1d3e09 (Build shared libraries only as the default) broke the
nettle package.

nettle really wants to statically link its tools, examples and testsuite
against its own libraries. But for a shared-only build, static libraries
are not even built, so the build breaks when trying to link any of them.

Fix that in two ways:

  - the proper way, by using whatever libraries are available, with a
    preference toward using shared libraries;

  - disabling both examples and testsuite since we do not need them.

Fixes numerous build failures:
    http://autobuild.buildroot.net/results/e93/e93da743c5b84b1bb6274aeee3fe3b52962c560c/
    http://autobuild.buildroot.net/results/51d/51d0138ff39c45603315dcedf1f654c18604e1a8/
    http://autobuild.buildroot.net/results/521/521d979658e402103f1a18fcfeab3f9705f0c000/
    ...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <jacmet@uclibc.org>