widl: Fix the embedded pointer offsets in generated code when the containing structure has padding.

[Rob Shearman]

Do so by calculating the alignment of members when iterating through
the structures and adding it onto the buffer and memory offsets.

Only call type_memsize once elsewhere in the embedded pointer
processing functions since the return value will be the same from the
second call.
---
 tools/widl/typegen.c |  127 ++++++++++++++++++++++++++++++++++---------------
 1 files changed, 88 insertions(+), 39 deletions(-)
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