ck_tflock: Initial check-in of reference implementation.
regressions/ck_tflock: Remove rwlock reference.
tflock: Task-fair reader-writer locks reference implementation.
regressions: Add ck_tflock tests to top-level Makefile.
regressions: Add ck_tflock build targets.
ck_tflock: Remove extraneous newline.
regressions: Add ck_tflock_init coverage.