travis: Switch `curl -s` to `curl -f`

I seem to have been a little too tired when I fixed up the container scripts,
applying the wrong flag!

src/ci/docker/scripts/android-ndk.sh

@@ -15,7 +15,7 @@ URL=https://dl.google.com/android/repository
 download_ndk() {
     mkdir -p /android/ndk
     cd /android/ndk
-    curl -sO $URL/$1
+    curl -fO $URL/$1
     unzip -q $1
     rm $1
     mv android-ndk-* ndk

src/ci/docker/scripts/android-sdk.sh

@@ -15,7 +15,7 @@ URL=https://dl.google.com/android/repository
 download_sdk() {
     mkdir -p /android/sdk
     cd /android/sdk
-    curl -sO $URL/$1
+    curl -fO $URL/$1
     unzip -q $1
     rm -rf $1
 }

src/ci/docker/scripts/crosstool-ng.sh

@@ -11,7 +11,7 @@
 set -ex
 
 url="http://crosstool-ng.org/download/crosstool-ng/crosstool-ng-1.22.0.tar.bz2"
-curl -s $url | tar xjf -
+curl -f $url | tar xjf -
 cd crosstool-ng
 ./configure --prefix=/usr/local
 make -j$(nproc)

src/ci/docker/scripts/dumb-init.sh

@@ -10,6 +10,6 @@
 
 set -ex
 
-curl -sOL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb
+curl -fOL https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64.deb
 dpkg -i dumb-init_*.deb
 rm dumb-init_*.deb

src/ci/docker/scripts/emscripten-wasm.sh

@@ -28,7 +28,7 @@ exit 1
 }
 
 # Download last known good emscripten from WebAssembly waterfall
-BUILD=$(curl -sL https://storage.googleapis.com/wasm-llvm/builds/linux/lkgr.json | \
+BUILD=$(curl -fL https://storage.googleapis.com/wasm-llvm/builds/linux/lkgr.json | \
     jq '.build | tonumber')
 curl -sL https://storage.googleapis.com/wasm-llvm/builds/linux/$BUILD/wasm-binaries.tbz2 | \
     hide_output tar xvkj

src/ci/docker/scripts/emscripten.sh

@@ -28,7 +28,7 @@ exit 1
 }
 
 cd /
-curl -sL https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz | \
+curl -fL https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz | \
     tar -xz
 
 cd /emsdk-portable

src/ci/docker/scripts/make3.sh

@@ -10,7 +10,7 @@
 
 set -ex
 
-curl -s https://ftp.gnu.org/gnu/make/make-3.81.tar.gz | tar xzf -
+curl -f https://ftp.gnu.org/gnu/make/make-3.81.tar.gz | tar xzf -
 cd make-3.81
 ./configure --prefix=/usr
 make

src/ci/docker/scripts/sccache.sh

@@ -10,7 +10,7 @@
 
 set -ex
 
-curl -so /usr/local/bin/sccache \
+curl -fo /usr/local/bin/sccache \
   https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-05-12-sccache-x86_64-unknown-linux-musl
 
 chmod +x /usr/local/bin/sccache