build: release 0.7.2

build: release 0.7.1.

Revert "include/spinlock: explicit casts for C++ compilation"

This reverts commit 8698ada.
Concurrency Kit uses idiomatic C99+.

regressions/ck_epoch_section_2: Force exit after timer.

build: Bump version for release.

regressions/ck_sequence: Use flag rather than counter value for first…

… set.

Prevents resetting exit barrier on overflow. Otherwise, hangs occur
on higher-performing systems.

ck_epoch: Fix typo (affects RMO targets).

build: Bump version for next release.

whitespace: Remove extraneous lines.

regressions/ck_stack: Align stack for cmpxchg16b.