[gomp4] small oacc cleanup

[Nathan Sidwell]

A  small patch committed to gomp4.

1) extract_oacc_routine_gwv does more work than necessary, we just nee to check 
if there are oacc function attributes.

2) We still want to run the oacc_device_lower pass, even if errors were detected.
   (a) we still need to process the loop  markers etc
   (b) I'm going to shortly be emitting diagnostics from the device compiler, 
and we don't want to only deliver ones from  the first offloaded function.

nathan
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