projectsmirrors: drop ftp.kddilabs.jp

ftp.kddilabs.jp has been shutdown and
now returns 404.

Signed-off-by: Yanase Yuki <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19407
Signed-off-by: Hauke Mehrtens <[email protected]>

scripts/projectsmirrors.json

@@ -29,7 +29,6 @@
 		"https://ftpmirror.gnu.org",
 		"https://mirror.csclub.uwaterloo.ca/gnu",
 		"https://mirror.netcologne.de/gnu",
-		"https://ftp.kddilabs.jp/GNU/gnu",
 		"https://www.nic.funet.fi/pub/gnu/gnu",
 		"https://mirror.navercorp.com/gnu",
 		"https://mirrors.rit.edu/gnu",