widl: Output correct code for freeing of conformant-sized and non-conformant strings.

[Rob Shearman]

_StubMsg.pfnFree should be used instead of NdrPointerFree for
conformant-sized strings since the buffer will have been allocated
using NdrAllocate.

Non-conformant strings do not need any freeing since they use a buffer
that is allocated on the stack.
---
 tools/widl/typegen.c |   19 ++++++++++++-------
 1 files changed, 12 insertions(+), 7 deletions(-)
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