[bugfix] fix canary support for functions with ASM inline #9
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Canaries with recent versions of gcc (>= 8) are not handled by _s_tack_check_fails() when gcc compiles functions with ASM inline in it (typically syscalls backend).
For those specific functions, canaries must be deactivated to avoid canary invalid construction.
INFO: this PR is a cherry-picking of PR #5 which handle this feature and allocator hardening in the same time. For this last PR, a clean rebase must first be done now that the new memory handling mechanism has been merged upstream.