fix(javac-wrapper): use `set -e` to propagate errors
If the extractor or javac calls in the wrapper fail, the wrapper should return an error code.
# Other environment variables that may be passed to this script include:
# KYTHE_EXTRACT_ONLY: if set, suppress the call to javac after extraction
+set -e
+
if [[ -z "$JAVA_HOME" ]]; then
readonly JAVABIN="$(which java)"
else
