tests: Link the simple access tests with -ldl

In SSSD, we use dlopen() and dlsym() in two files
src/providers/data_provider_be.c and src/providers/proxy/proxy_init.c.
Hence we should explicitly link with -ldl also in simple_access-tests.

SSSD can be compiled with two crypto libraries nss or libcrypto. NSS has
dependency nspr which depends on "libdl and libpthread" This is a reason why
compilation of test did not fail even if -ldl was not explicitly added to
simple_access_tests_LDADD. But libcrypto doesn't depend on libdl, so in
this case compilation of tests will not be successful.

Upstream nspr 4.9 has two ways have to obtain metainformation about
libraries
pkg-config and own script nspr-config. First one doesn't list "-ldl"
"-lpthread" but second one lists both "-ldl" "-lpthread"

That's also why the Ubuntu maintainer found this bug -- Fedora has got
patched version of nspr, but Debian (Ubuntu) doesn't

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