pidgin: update to 2.14.6

[tibequadorian]

Continuation of #27704

-Ddoc=false doesn't work because the option doesn't exist :/ @ericonr

General

• This is a new package and it conforms to the quality requirements

Have the results of the proposed changes been tested?

• I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
• I generally don't use the affected packages but briefly tested this PR

[ericonr]

Thanks for picking this up!

[ericonr]

Wow, the existence of such a thing hurts me :D