py/misc: Add a way to detect sanitizer builds.

Clang and gcc>=14 can use __has_feature() to detect if a sanitizer
is enabled, but older GCC has no mechanism - need to set a macro
explicitly for this to be recognised.

Necessary for increasing some resource limits in sanitizer builds.
Important not to use to avoid real issues!

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

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