build(minor): use arm-kobo-linux-gnueabihf for kobo TC prefix
build(minor): use arm-kobo-linux-gnueabihf for kobo TC prefix

To keep it consistent with the new koxtoolchain

NiLuJe/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,koreader/koreader-base,Hzj-jie/koreader-base,houqp/koreader-base,koreader/koreader-base,koreader/koreader-base,Hzj-jie/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,apletnev/koreader-base,apletnev/koreader-base,houqp/koreader-base,Frenzie/koreader-base,Hzj-jie/koreader-base,houqp/koreader-base,NiLuJe/koreader-base,houqp/koreader-base,apletnev/koreader-base,apletnev/koreader-base,koreader/koreader-base,Hzj-jie/koreader-base