pidgin/pidgin

Remove the deprecated keyring API.

2021-04-21, Gary Kramlich
32c1f097d4e8
Remove the deprecated keyring API.

I've disable the building of the internal keyring for now but left it so it
can be referenced when it is ported to the CredentialProvider API.

Testing Done:
Ran Pidgin and verified the preferences window worked.

Bugs closed: PIDGIN-17486

Reviewed at https://reviews.imfreedom.org/r/624/
#define REVISION "@VCS_TAG@"