Add DEPENDS option to REFLEX_GENERATE_DICTIONARY()
Add DEPENDS option to REFLEX_GENERATE_DICTIONARY()

This is equivalent to the EXTRA_DEPENDENCIES added in
ROOT_GENERATE_DICTIONARY(), but has been named DEPENDS
to follow the style of CMake's own commands.

Fixes: ROOT-7549

root-mirror/root,root-mirror/root,karies/root,olifre/root,olifre/root,karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root,olifre/root,karies/root,olifre/root,karies/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,karies/root,root-mirror/root