version: Check the size of the input buffer so we don't write past the end

[James Hawkins]

Hey,

This fixes the current problem with bug 2482.  The app calls
GetFileVersionInfo with a buffer of length 260 bytes. 
GetFileVersionInfoSize shows that the size is ~1700 bytes.  The
pointer (data + fileversioninfosize) is definitely invalid.  This
change makes sure there's room in the input buffer for the size of the
FileVersionInfo and the string "FE2X".

Changelog
* Check the size of the input buffer so we don't write past the end.

--
James Hawkins
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