[][Remove old buggy uclibc++ support]

[Description]
Remove old buggy uclibc++ support

1. sync from OpenWRT trunk
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=6b2ed6101e4c97691ba3aa94f25895be536b3870

[Release-log]
N/A

Change-Id: Ifd1773b1cd9513dd7d0f8b0d5421d2f63de08fa6
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5208297
1 file changed