pidgin/pidgin

Prepare for the 2.14.10 release
release-2.x.y v2.14.10
2022-06-02, Gary Kramlich
594d72369304
Prepare for the 2.14.10 release

Testing Done:
Ran `codespell` and `make distcheck`

Reviewed at https://reviews.imfreedom.org/r/1489/
#define CUSTOM_USER_DIRECTORY "/dev/null"
#define CUSTOM_PLUGIN_PATH ""
#define PLUGIN_SAVE_PREF "/purple/nullclient/plugins/saved"
#define UI_ID "nullclient"