Use uint64_t where appropriate for mData, fails to build on OpenBSD
otherwise with wrong casts/no matching template.
dom/base/nsStructuredCloneContainer.cpp:96: error: invalid conversion from 'PRUint64*' to 'uint64_t*'
dom/base/nsStructuredCloneContainer.cpp:131: error: invalid conversion from 'PRUint64*' to 'uint64_t*'
dom/workers/WorkerPrivate.cpp:822: error: no matching function for call to 'JSAutoStructuredCloneBuffer::steal(uint64**, size_t*)'
../../dist/include/jsapi.h:4641: note: candidates are: void
JSAutoStructuredCloneBuffer::steal(uint64_t**, size_t*, uint32_t*) <near
match>
dom/workers/WorkerPrivate.cpp:833: error: no matching function for call to 'JSAutoStructuredCloneBuffer::adopt(uint64*&, size_t&)'
../../dist/include/jsapi.h:4634: note: candidates are: void
JSAutoStructuredCloneBuffer::adopt(uint64_t*, size_t, uint32_t) <near
match>
dom/workers/WorkerPrivate.cpp:853: error: no matching function for call to 'JSAutoStructuredCloneBuffer::steal(uint64**, size_t*)'
../../dist/include/jsapi.h:4641: note: candidates are: void
JSAutoStructuredCloneBuffer::steal(uint64_t**, size_t*, uint32_t*) <near
match>
475bec0915