Add -fi flag for autoreconf

Author: oscarbenjamin

bin/build_dependencies_unix.sh

@@ -182,7 +182,7 @@ if [ $USE_GMP = "gmp" ]; then
         echo "           patching GMP"
         echo --------------------------------------------
         patch -N -Z < ../../../bin/patch-C23.diff
-        autoreconf
+        autoreconf -fi
       fi
 
       # Show the output of configfsf.guess