Add a command-line option (-M or --no_mcheck) to disable mcheck heap
protection at runtime. When mcheck is disabled, the wrapper functions
pass through directly to the underlying allocator without adding
headers or checking for corruption.
This is useful for debugging when mcheck interferes with test results,
such as when memory-leak detection reports false positives due to
accumulated allocations from other tests.
Changes:
- Add disable_mcheck flag to sandbox_state
- Add mcheck_set_disabled() function to mcheck API
- Modify dlmalloc wrappers to bypass mcheck when disabled
- Add stub for when MCHECK_HEAP_PROTECTION is not enabled
- Document the new option in sandbox.rst
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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