Use --host when building FLINT for wheels

Author: oscarbenjamin

bin/build_dependencies_unix.sh

@@ -282,13 +282,8 @@ curl -O -L https://github.com/flintlib/flint/releases/download/v$FLINTVER/flint-
 tar xf flint-$FLINTVER.tar.gz
 cd flint-$FLINTVER
   ./bootstrap.sh
-  # --host=$HOST_ARG\ # host is ignored
-  # --enable-arch works on 3.1.3p1, not available  on HEAD
   ./configure --prefix=$PREFIX\
-    --enable-arch=${HOST_ARG%%-*}\
-    --disable-assembly\
-    --disable-avx2\
-    --disable-avx512\
+    --host=$HOST_ARG\
     $FLINTARB_WITHGMP\
     --with-mpfr=$PREFIX\
     --disable-static\