* Do not implicitly load Variants unit when compiling units. Doing so is mostly waste of time, and introduces unwanted build dependencies. It is enough to set uf_uses_variants flag for units, and examine these flags when compiling program/library. Resolves #24880.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25269 3ad0048d-3df7-0310-abae-a5850022a9f2