update darshan-gen-* scripts to use darshan-configure
I'm not certain about ticket yet; we need to re-evaluate after implementing darshan-configure. It may make the existing compiler wrappers simpler if they do something like:
ld darshan-configure --pre-ld-flags
NORMAL_ARGUMENTS darshan-configure --post-ld-flags
rather than hardcoding the full list in the generated script itself.