enable CONFIG_PIPES where CONFIG_LIBUV is enabled

after running the following script, reverted a few
unrelated modifications manually.
```
git grep -l CONFIG_LIBUV|grep defconfig|while read FILE;do
DIR=$(dirname $FILE)
./tools/configure.sh -E $DIR
kconfig-tweak -e CONFIG_PIPES
kconfig-tweak -d CONFIG_HOST_MACOS
make savedefconfig
cp defconfig $FILE
done
```

cf. apache#14773

Author: yamt

boards/sim/sim/sim/configs/lua/defconfig

@@ -52,6 +52,7 @@ CONFIG_NSH_BUILTIN_APPS=y
 CONFIG_NSH_FILE_APPS=y
 CONFIG_NSH_READLINE=y
 CONFIG_PATH_INITIAL="/bin"
+CONFIG_PIPES=y
 CONFIG_PSEUDOFS_ATTRIBUTES=y
 CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_READLINE_TABCOMPLETION=y