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test: thread: set default asan options to use_sigaltstack=0

Alexandre Janniaux requested to merge alexandre-janniaux/vlc:test-thread-fixup-asan into master

use_sigaltstack=1 has been the default in ASAN for a few year, but starting with glibc 2.34, cancellation (because of setjmp/longjmp usage) is corrupting the stack allocated by ASAN, leading to check failure when ASAN is ready to check the application state. It does happen both with VLC itself, and the tests doing cancellation, making test_thread fail in particular.

Disable sigaltstack option in ASAN by default to avoid issue with thread cancellation corrupting the ASAN stack markers.

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