Relaxed sybmiflow-yosys required libffi version to be >3.2.1
Relaxed sybmiflow-yosys required libffi version to be >3.2.1

Signed-off-by: Maciej Kurc <572803cc6e8d7bb35033942e4b03254951a2e0d6@antmicro.com>

SymbiFlow/conda-packages,SymbiFlow/conda-packages