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1857e62fdc
This fixes compilation of the `re` natmod example when built with Picolibc in the CI environment. Ubuntu 22.04's combination of its bare metal RISC-V toolchain and its version of Picolibc makes the `alloca` symbol more elusive than it should be. This commit makes the `re` natmod try harder to get an `alloca` implementation. Signed-off-by: Alessandro Gatti <a.gatti@frob.it>