devel/libatomic_ops: update to 7.6.14

Port changes:

• enable shared library
• Fix makefile to make portclippy happy

Major changes:

• Avoid AO_stack_t to cross CPU cache line boundary
• Do not assume 'ordered except earlier write' for UWP/arm64
• Ensure result of AO_test_and_set is always AO_TS_CLEAR or AO_TS_SET
• Fix 'AO_malloc redefinition' MS VC warning caused by attributes mismatch
• Repeat black list check on CAS fail in stack_push_explicit_aux_release
  
  Full changelog: https://github.com/ivmai/libatomic_ops/releases/tag/v7.6.14

PR: 268698
Reported by: pkubaj