opencv: use stdenv to find python

Under superenv and with env :userpaths, the system python is always
used.
cvsps: fix building manpage
tap: adjust formula count for unsymlinked files

Relying on the output of `tapped` results in ignoring formulae which
already exist in core, with messages like "Tapped 0 formula" for
non-empty taps.
jenkins 1.504
libffi 3.0.12

Closes #18226.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
osmosis 0.42

Closes #18228.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
mercurial 2.5.2

Closes #18227.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
openimageio 1.1.7

Closes #18225.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
wine: enable clang warning with --devel

Closes #18223.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
wine: add version note for clang warning
olsrd 0.6.5.2

Closes #18221.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
enet 1.3.6

Closes #18232.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libmemcached 1.0.16

Closes #18239.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
protobuf 2.5.0

Closes #18241.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
pigz 2.3

Closes #18236.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
dgtal 0.6.0

Closes #18233.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
openrtsp 2013.02.27
pass: silent version update

Closes #18218.
oath-toolkit 2.0.2

Closes #18217.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Pig 0.11.0

Closes #18245.

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