Make prepare.sh abort on first error.

vincentbernat · vincentbernat · commit 3fa3aeef3900 · 2014-09-01T08:08:35.000+02:00
The script shouldn't be able to continue with a missing command or a
failure to download Oracle JDK.
diff --git a/prepare.sh b/prepare.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 export LC_ALL=C
 export LANG=C
 
