mshtml: fix MSVC build in htmllocation.c

[Thomas Faber]

This removes the use of two Variable Length Arrays.
Instead of filling a local buffer, then allocating a new one using
SysAllocString[Len], the strings are now directly written to the latter
buffer.
Note that the 'len' variable in hunk 2 does not need to count in the
terminating null in this case because SysAllocStringLen automatically
adds one.
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