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Missing libfqfft includes #212

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@diega

I'm on 6c705e3, building with -DCURVE=ALT_BN128 -DLOWMEM=ON -DWITH_PROCPS=OFF -DWITH_SUPERCOP=OFF -DMULTICORE=OFF -DUSE_PT_COMPRESSION=OFF -DPROFILE_OP_COUNTS=OFF -DUSE_ASM=OFF -DPERFORMANCE=OFF -DUSE_LINKED_LIBRARIES=OFF and when I try to

#include <libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.hpp>

I get the following error

In file included from [...]/snark/include/libsnark/reductions/r1cs_to_qap/r1cs_to_qap.hpp:35,
                 from [...]/snark/include/libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.tcc:32,
                 from [...]/snark/include/libsnark/zk_proof_systems/ppzksnark/r1cs_ppzksnark/r1cs_ppzksnark.hpp:469,
                 from [...]/snark_wrapper.cpp:2:
[...]/snark/include/libsnark/relations/arithmetic_programs/qap/qap.hpp:28:10: fatal error: libfqfft/evaluation_domain/evaluation_domain.hpp: No such file or directory
   28 | #include <libfqfft/evaluation_domain/evaluation_domain.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

I checked my <INSTALL_DIR>/include and I cannot see any header for libfqfft, only for libsnark and libff.

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