git-hooks: build and test with --no-default-features too.

Stores output in separate target/ subdir, so it shouldn't get clobbered.

git-hooks/pre-commit

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 set -e
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+
 pushd () {
     command pushd "$@" > /dev/null
 }
@@ -18,9 +20,14 @@ RT=rtchallenge
 AFFECTED="$(git diff-index --cached --name-only HEAD)"
 #echo "AFFECTED $AFFECTED"
 RT_AFFECTED=$(echo "${AFFECTED:?}" | grep ${RT:?} || true)
+NO_FEATURES_TARGET_DIR="${SCRIPT_DIR:?}/../../rtchallenge/target/no-default-features"
 if [ ! -z "$RT_AFFECTED" ]; then
   echo "Files for the rt challenge were touched, running tests"
-  cd ${RT:?} && cargo build --examples && cargo test
+  cd ${RT:?} && \
+    cargo build --examples && \
+    cargo test && \
+    cargo build --target-dir=${NO_FEATURES_TARGET_DIR:?} --no-default-features --examples && \
+    cargo test --target-dir=${NO_FEATURES_TARGET_DIR:?} --no-default-features 
 fi
 # Uncomment to debug presubmit.
 #exit 1