Adds extra cflags '-fno-asynchronous-unwind-tables'
to avoid the MinGW build error:
Error: invalid register for .seh_savexmm
Fixes: 5c38c33f78 ("net/i40e: disable AVX512 with MinGW")
Signed-off-by: Leyi Rong <leyi.rong@intel.com>
Tested-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>