Revert "[RVec] Fix namespace related compilation issues on windows"
Revert "[RVec] Fix namespace related compilation issues on windows"

This reverts commit 7d450e33e5cd1874674bc7ccd47cd9be23a91c1e.

Reverting RVec's SBO implementation until we have a proper fix
for the crashes seen in ROOT-10079.

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