skipfish: depends on pcre

Closes #18096.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
git-flow-avh 1.5.0

Closes #18084.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
gcutil 1.7.1

Closes #18086.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
povray: link to boost-thread

Fixes #18068.
Closes #18073.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
sphinx: clean up mysql/postgres handling