Simplify conditions for superenv activation

`MacOS::Xcode.without_clt? && MacOS.sdk_path.nil?` should never be true.

In its earliest form, this would raise a bare RuntimeError in an effort
to have the bug reported. Later, it was changed to silently disable
superenv. But we don't want to do that. If there's a bug, or the user's
system is misconfigured, we want to know, so that we can fix the bug, or
the user can fix their system. So let's remove the condition.
Only directories are candidates for superenv bin
neon: always use Homebrew's openssl

We now always use Homebrew's openssl. Users can install certs by adding
.pem files to
  $(brew --prefix)/etc/openssl/certs
and then running
  $(brew --prefix openssl)/bin/c_rehash
cadaver: always use Homebrew's openssl
subversion: always use Homebrew's openssl
subversion: update 1.8.8 bottle.
libmowgli: use Homebrew's openssl
dovecot: use Homebrew's openssl
ncrack: use Homebrew's openssl
freetds: use Homebrew's openssl
postgres-xc: use Homebrew's openssl
rdesktop: use Homebrew's openssl
opensc: drop comment that originated with totally different code
lv2 1.8.0

Closes #28616.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
mda-lv2 1.2.2
lilypond devel 2.19.5

Closes #28621.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Ansible 1.5.5

Closes #28613.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libsvm 3.18

Closes #28606.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
influxdb 0.5.10

Closes #28622.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
influxdb: update 0.5.10 bottle.