opencv: requires Xcode

Could probably patch for CLT-only, but I don't have a machine
to test on - @adamv
opam 0.9.5

Closes #18334.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
unac: look for iconv_open

The function that unac's configure script needs to check for seems to
be "iconv_open" now, not "libiconv_open".

Closes #18108.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
ranger 1.6.0

Closes #18337.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
open-scene-graph: use /usr/bin/sw_vers to determine osx version

current behaviour uses SDKSettings.plist to determine osx version but this
file is only available when XCode is installed.

Closes #18210.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Revert "libffi 3.0.12"

This reverts commit 2efe718a3b4b5e124004fdbb68cc13da5c8de41c.
libffi: note why we reverted
Adding libmodbus.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
libmodbus 3.0.3

Closes #18263.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
bash 4.2.45
wireshark 1.8.6
Python: update pip and distribute

Closes #18358.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
clozure-cl 1.9

Closes #18351.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
sshpass: add to blacklist.

We keep rejecting this again and again.

See discussion in #9577, #12941, #13855.

Closes #18332.
audit: correct inverted has_trailing_newline condition

has_trailing_newline? checked if formula did not have a trailing
newline. Invert regex and invert audit check.

Closes #18359.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Index pkgconfig directories by MacOS.version
Exclude global pkgconfig dirs under superenv
bottles: remove unused 'version' from DSL.
Warn on bottles skipped due to non-default Cellar.

Closes #18333.