pidgin-encryption: update to 3.1

[ryandesign@…]

Here is a patch which makes the following changes to pidgin-encryption:

• update to 3.1
• rewrite master_sites so that the sourceforge fetch group is used
• use rmd160 and sha256 checksums
• disable universal variant since dependency nss doesn't have one
• simplify destroot

This should build correctly but I cannot test it because I cannot get its dependency pidgin to build; see #30790. If you can get pidgin to build, and this update is successful, let me know and I can commit it.

[ryandesign@…]

untested patch

[ryandesign@…]

r83200.