Temporarily disable redox target

ci/build.sh

@@ -122,6 +122,9 @@ i586-unknown-linux-musl \
 x86_64-unknown-cloudabi \
 "
 
+# FIXME: temporarirly disable the redox target
+# https://github.com/rust-lang/libc/issues/1457
+# x86_64-unknown-redox
 RUST_NIGHTLY_LINUX_TARGETS="\
 aarch64-fuchsia \
 armv5te-unknown-linux-gnueabi \
@@ -132,7 +135,6 @@ x86_64-fortanix-unknown-sgx \
 x86_64-fuchsia \
 x86_64-pc-windows-gnu \
 x86_64-unknown-linux-gnux32 \
-x86_64-unknown-redox \
 "
 
 RUST_OSX_TARGETS="\