toolchain/buildroot: default to uClibc

Otherwise we're getting musl for everything except those who have a
default (mips64*).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

toolchain/toolchain-buildroot/Config.in

@@ -22,6 +22,7 @@ source "package/linux-headers/Config.in.host"
 
 choice
 	prompt "C library"
+	default BR2_TOOLCHAIN_UCLIBC
 	default BR2_TOOLCHAIN_BUILDROOT_EGLIBC if BR2_mips64 || BR2_mips64el
 
 config BR2_TOOLCHAIN_BUILDROOT_UCLIBC