Revert "[cling] Enable `-Wredundant-parens`"
Revert "[cling] Enable `-Wredundant-parens`"

This reverts commit eb52895d22aaad0a88d47b8e7bb18c7f47ff35be.

As discussed, we should try to make clang parse input containing solely a
function-style cast (e.g. `bool(i)`) as an expression instead of a declaration.

In the interim, this patch is reverted to silence unwanted warnings in
third-party code.
The PR https://github.com/root-project/root/pull/9695 will also be closed.

root-mirror/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling