[axl] don't use sanitizer by default
[axl] don't use sanitizer by default

new versions of GCC sanitizer report mismatch new-vs-delete in LLVM and
therefore cause tests to fail; new versions of Clang sanitizer simply
crash even on tiny projects.

vovkos/axl,vovkos/axl,vovkos/axl,vovkos/axl