fc8139b146
Fix compilation on Cygwin, since 50b22354, by adding c99_alloca.h include,
which should know how to portably make the alloc() prototype available.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>