Remove upstreamed patches.

ChangeLog: https://github.com/brndnmtthws/conky/releases/tag/v1.21.2

Features

 * Don't include the -pre in install dir path.

Bug fixes

 * Fix build with specific option combination.
 * Remove dpi scaling of minimum_width & maximum_width
 * Make dpi_scale match original behavior
 * Don't test colour names without map
 * Fix typo in conky.cc

Miscellaneous

 * Bump version
 * Docker: don't login without creds