widl: Only base types or reference pointers to base types don't need to be freed.

[Robert Shearman]

There are other cases where calls to Free functions can be omitted (such 
as types always unmarshalled using buffer memory with no embedded 
pointers), but these are easier dealt with inside the relevent case in 
write_remoting_arg.
---
  tools/widl/typegen.c |   14 +++-----------
  1 files changed, 3 insertions(+), 11 deletions(-)
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