Use --without-cross-bootstrap for Cygwin build

Author: Blackhex

.github/scripts/toolchain/build-cygwin.sh

@@ -45,7 +45,7 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$CYGWIN_BUILD_PATH/Makefile" ]]; then
             --disable-dumper \
             --with-sysroot=$TOOLCHAIN_PATH \
             --with-build-sysroot=$TOOLCHAIN_PATH \
-            --with-cross-bootstrap \
+            --without-cross-bootstrap \
             $HOST_OPTIONS \
             $TARGET_OPTIONS
     echo "::endgroup::"