[PATCH] panda: build.sh: change RELEASE/DEBUG param handling

The attached patch changes the PandaBoardPkg/build.sh script RELEASE or DEBUG parameter handling.

Before this patch, build.sh can be called thus: ./build.sh ./build.sh -b DEBUG ./build.sh RELEASE

This patch simplifies the way you pass the debug/release parameter into build.sh so that build scripts can simply pass DEBUG or RELEASE, without having to create a special case to add the "-b".

Eg. ./build.sh ./build.sh DEBUG ./build.sh RELEASE