Merge PR #24133 into master

Merge PR #24133 into master

* refs/pull/24133/head:
	common/Finisher: convert to ceph::mutex etc
	common/ceph_mutex: ceph::{mutex,condition_variable,lock_guard}
	common/mutex_debug: take const char * to ctor, and require a name
	common/mutex_debug: add lockdep support for recursive_mutex_debug
	common/mutex_debug: fix whitespace
	common/mutex_debug: refactor to remove intermediate class
	common/lockdep: add recursive flag for _will_lock
	do_cmake.sh: default to Debug build
	.gitignore: ignore build.*/

Reviewed-by: Casey Bodley <cbodley@redhat.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>